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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation      
Number of stock incentive plans 2    
Total unrecognized compensation cost related to the unvested awards $ 20.8    
Total weighted average remaining term of unrecognized compensation costs 2 years 6 months    
Compensation cost recognized 9.6 5.8 5.3
ISOs | Class A common stock
      
Stock-based compensation      
Minimum exercise price as percentage of fair market value of common stock on grant date 100.00%    
NSOs | Class A common stock
      
Stock-based compensation      
Minimum exercise price as percentage of fair market value of common stock on grant date 100.00%    
Second Amended and Restated 2004 Stock Incentive Plan
      
Stock-based compensation      
Number of stock-based compensation plans available for grant of new equity awards 1    
Second Amended and Restated 2004 Stock Incentive Plan | Class A common stock
      
Stock-based compensation      
Shares authorized 1,650,400    
Second Amended and Restated 2004 Stock Incentive Plan | Stock options
      
Stock-based compensation      
Vesting period, if not immediate 4 years    
Percentage of stock options becoming exercisable 25.00%    
Expiration period 10 years    
Total unrecognized compensation cost related to the unvested awards 10.6    
Total weighted average remaining term of unrecognized compensation costs 2 years 10 months 24 days    
Additional stock compensation expense   0.6 2.2
Summary of stock option activity and related information      
Outstanding at beginning of year (in shares) 1,064,000 1,272,000 1,303,000
Granted (in shares) 379,000 415,000 295,000
Cancelled/Forfeitures (in shares) (53,000) (33,000) (78,000)
Exercised (in shares) (361,000) (590,000) (248,000)
Outstanding at end of year (in shares) 1,029,000 1,064,000 1,272,000
Exercisable at end of year (in shares) 249,000 360,000 745,000
Weighted Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 33.37 $ 30.43 $ 29.00
Granted (in dollars per share) $ 54.78 $ 37.67 $ 29.39
Cancelled/Forfeitures (in dollars per share) $ 36.97 $ 31.18 $ 30.38
Exercised (in dollars per share) $ 31.73 $ 30.19 $ 21.68
Outstanding at end of year (in dollars per share) $ 41.66 $ 33.37 $ 30.43
Exercisable at end of year (in dollars per share) $ 32.35 $ 30.91 $ 30.61
Weighted Average Intrinsic Value      
Outstanding at end of year (in dollars per share) $ 20.21    
Exercisable at end of year (in dollars per share) $ 29.52    
Aggregate intrinsic values of exercisable options (in dollars) 7.3    
Total intrinsic value of options exercised 7.4 5.7 3.9
Fair value assumptions      
Expected life 6 years 6 years 6 years
Expected stock price volatility (as a percent) 40.30% 41.20% 40.90%
Expected dividend yield (as a percent) 1.00% 1.20% 1.50%
Risk-free interest rate (as a percent) 1.70% 0.90% 1.60%
Estimated forfeiture rate (as a percent) 6.75% 6.75% 6.75%
Weighted average grant-date fair value of stock options (in dollars per share) $ 20.30 $ 13.49 $ 10.19
Second Amended and Restated 2004 Stock Incentive Plan | Stock options | Selling, general and administrative expenses
      
Stock-based compensation      
Compensation cost recognized 3.8 2.1 1.6
Second Amended and Restated 2004 Stock Incentive Plan | Stock options | Class A common stock
      
Weighted Average Intrinsic Value      
Company's closing Common Stock price (in dollars per share) $ 61.87    
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock
      
Stock-based compensation      
Additional stock compensation expense   0.2 0.8
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock | Maximum
      
Stock-based compensation      
Vesting period, if not immediate 3 years    
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares
      
Stock-based compensation      
Vesting rate per year for maximum vesting period 0.33    
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares | Maximum
      
Stock-based compensation      
Vesting period, if not immediate 3 years    
Management Stock Purchase Plan | Class A common stock
      
Stock-based compensation      
Shares available for future grants of new equity awards 897,029    
Shares authorized 2,000,000    
Exercise price as percentage of fair market value of common stock on grant date 67.00%    
Management Stock Purchase Plan | Restricted stock | Class A common stock
      
Weighted Average Intrinsic Value      
Company's closing Common Stock price (in dollars per share) $ 61.87    
Management Stock Purchase Plan | Restricted stock units (RSUs)
      
Stock-based compensation      
Total unrecognized compensation cost related to the unvested awards 0.8    
Total weighted average remaining term of unrecognized compensation costs 1 year 4 months 24 days    
Compensation cost recognized $ 0.7 $ 0.8 $ 1.3
Fair value assumptions      
Expected life 3 years 3 years 3 years
Expected stock price volatility (as a percent) 34.10% 38.30% 44.90%
Expected dividend yield (as a percent) 0.90% 1.10% 1.20%
Risk-free interest rate (as a percent) 0.40% 0.40% 1.20%
Estimated forfeiture rate (as a percent) 6.30% 6.30% 6.30%
Weighted average grant-date fair value (in dollars per share) $ 18.05 $ 15.68 $ 16.25
Management Stock Purchase Plan | Restricted stock units (RSUs) | Minimum
      
Stock-based compensation      
Vesting period, if not immediate 3 years