IPO Assumptions
                      ($ and shares in millions, except per share amounts)                              Value
                      Filing range – low                                                                 $20.00    
                      Filing range – high                                                                $22.00    
                      Primary shares issued                                                                5.500    
                      Secondary shares sold                                                                4.500    
                      Underwriting discount (%)                                                               6.0% 
                      IPO discount (%)                                                                      15.0% 
                      Overallotment
                      Overallotment ("Greenshoe") (%)                                                       15.0% 
                      Primary allocation (%)                                                               100.0% 
                      Exercise shoe?                                                                         Yes    
                      IPO fees & expenses
                      SEC registration fee                                                                  $0.0    
                      FINRA Filing fee                                                                        0.0    
                      Nasdaq listing fees and expenses                                                        0.0    
                      Transfer agent and registrar fees and expenses                                          0.1    
                      Printing fees and expenses                                                              0.7    
                      Legal fees and expenses                                                                 3.0    
                      Accounting fees and expenses                                                            1.5    
                      Miscellaneous                                                                           0.1    
                      Issuer Assumptions
                      ($ and shares in millions, except per share amounts)                              Value
                      Class A common stock                                                               20.300    
                      Class B common stock                                                               26.100    
                      Options strike price                                                               $20.00    
                      Options outstanding                                                                  2.900    
                      Issuer 2013E earnings                                                                $70.0    
                      Issuer 2014E earnings                                                                $95.0    
                  Fully Diluted Share Count ("FDSO") Matrix
                  Options strike price                  $20.00    
                  Options outstanding                    2.900    
                                                                                                         Potential Range of IPO Prices
               1 (shares in millions)                                  $18.00          $19.00          $20.00         $21.00          $22.00    
               2
               3 Class A common stock                                  20.300          20.300          20.300         20.300          20.300    
               4 Class B common stock                                  26.100          26.100          26.100         26.100          26.100    
               5 Total basic shares outstanding                        46.400          46.400          46.400         46.400          46.400    
               6 ( + ) Stock options                                         –               –               –          0.138          0.264    
               7 Fully diluted shares outstanding                      46.400          46.400          46.400         46.538          46.664    
Potential Range of IPO Prices
                     $23.00            $24.00    
                     20.300            20.300    
                     26.100            26.100    
                     46.400            46.400    
                       0.378            0.483    
                     46.778            46.883    
                      IPO Calculations
                                                                                                                                 Filing Range
                      ($ and shares in millions, except per share amounts)                                       Low               Midpoint                High
                      Offering price per share                                                                     $20.00               $21.00               $22.00    
                      Shares
                      Shares offered
                      Primary shares issued                                                                          5.500                5.500                5.500    
                      Secondary shares sold                                                                          4.500                4.500                4.500    
                      Base deal shares issued/sold                                                                 10.000               10.000               10.000    
                      Overallotment – primary shares                                                                 1.500                1.500                1.500    
                      Overallotment – secondary shares                                                                    –                    –                    –    
                      Total overallotment                                                                            1.500                1.500                1.500    
                      Total shares issued/sold                                                                     11.500               11.500               11.500    
                      Pro forma shares
                      Existing Issuer FDSO                                                                         46.400               46.538               46.664    
                      ( + ) Primary shares issued                                                                    7.000                7.000                7.000    
                      Pro forma Issuer FDSO                                                                        53.400               53.538               53.664    
                      Offering Size
                      Base deal                                                                                    $200.0               $210.0               $220.0    
                      ( + ) Overallotment                                                                             30.0                 31.5                 33.0    
                      Total offering size                                                                          $230.0               $241.5               $253.0    
                      IPO Discount & Fees
                      Underwriting discount
                      IPO price per share                                                                          $20.00               $21.00               $22.00    
                      ( – ) Underwriting discount (6.0%)                                                             (1.20)               (1.26)               (1.32)   
                      Net IPO price per share                                                                      $18.80               $19.74               $20.68    
                      Offering expenses
                      SEC registration fee                                                                            $0.0                 $0.0                 $0.0    
                      FINRA Filing fee                                                                                  0.0                  0.0                  0.0    
                      Nasdaq listing fees and expenses                                                                  0.0                  0.0                  0.0    
                      Transfer agent and registrar fees and expenses                                                    0.1                  0.1                  0.1    
                      Printing fees and expenses                                                                        0.7                  0.7                  0.7    
                      Legal fees and expenses                                                                           3.0                  3.0                  3.0    
                      Accounting fees and expenses                                                                      1.5                  1.5                  1.5    
                      Miscellaneous                                                                                     0.1                  0.1                  0.1    
                      Total expenses                                                                                  $5.5                 $5.5                 $5.5    
                      IPO Proceeds
                      Gross primary proceeds                                                                       $140.0               $147.0               $154.0    
                      ( – ) Underwriting discount                                                                      (8.4)                (8.8)                (9.2)   
                      ( – ) Expenses                                                                                   (5.5)                (5.5)                (5.5)   
                      Net primary proceeds                                                                         $126.1               $132.7               $139.3    
                      Valuation
                      Market capitalization
                      IPO valuation                                                                              $1,068.0             $1,124.3             $1,180.6    
                      ( + ) IPO discount                                                                             160.2                168.6                177.1    
                      Fully distributed ("FD") valuation                                                         $1,228.2             $1,292.9             $1,357.7