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Shareholders' Equity - RSU Awards and SSAR Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
RSUs        
Awards Outstanding        
Balance at the beginning of the period (in shares) 800,000 700,000 1,000,000  
Granted (in shares) 200,000 300,000    
Issued (in shares) (300,000) (200,000) (300,000)  
Balance at the end of the period (in shares) 700,000 800,000 700,000 1,000,000
Balance at the beginning of the period (in dollars per share) $ 38.55 $ 35.61 $ 34.06  
Granted (in dollars per share) 51.00 44.34 40.59  
Issued (in dollars per share) 38.80 36.67 32.00  
Forfeited (in dollars per share) 42.65 40.25 35.92  
Balance at the end of the period (in dollars per share) $ 43.10 $ 38.55 $ 35.61 $ 34.06
Aggregate Intrinsic Value $ 28.0 $ 36.9 $ 31.8 $ 39.9
Weighted Average Remaining Vesting Term 1 year 8 months 12 days 1 year 6 months 1 year 3 months 18 days 1 year 6 months
Aggregate intrinsic value of awards issued $ 15.3 $ 10.1 $ 11.3  
SSAR Awards        
Awards Outstanding        
Balance at the beginning of the period (in shares) 200,000 200,000 400,000  
Granted (in shares)     200,000  
Issued (in shares)   0    
Exercised (in shares)     (400,000)  
Balance at the end of the period (in shares) 200,000 200,000 200,000 400,000
Balance at the beginning of the period (in dollars per share) $ 40.06 $ 37.69 $ 15.30  
Granted (in dollars per share) 57.48   41.42  
Exercised (in dollars per share) 25.08 22.26 14.07  
Forfeited (in dollars per share)   40.91 37.34  
Balance at the end of the period (in dollars per share) $ 42.91 $ 40.06 $ 37.69 $ 15.30
Aggregate Intrinsic Value   $ 1.5 $ 1.5 $ 10.9
Weighted Average Remaining Vesting Term 2 years 6 months 3 years 3 years 7 months 6 days 7 months 6 days
SSAR Awards Exercisable        
SSAR Awards (in shares)       300,000
Weighted Average Exercise Price (in dollars per share) $ 42.06 $ 35.81 $ 23.25 $ 16.02
Aggregate Intrinsic Value   $ 0.6 $ 1.1 $ 8.1
Weighted Average Remaining Contractual Life 2 years 2 months 12 days 2 years 2 months 12 days 1 year 8 months 12 days
Aggregate intrinsic value of SSAR Awards exercised $ 0.5 $ 0.8 $ 9.1  
Assumptions used to determine weighted average fair value        
Weighted average fair value of SSAR Awards (in dollars per share) $ 14.78   $ 11.65  
Expected term 4 years 3 months 18 days   4 years 1 month 6 days  
Volatility (as a percent) 30.20%   38.00%  
Dividend yields (as a percent) 0.30%   0.40%  
Risk-free interest rates (as a percent) 1.20%   0.60%