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Shareholders' Equity - RSU Awards and SSAR Awards (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
RSUs        
Awards Outstanding        
Balance at the beginning of the period (in shares) 1.6 1.2 0.7  
Granted (in shares) 0.2 0.6 0.7  
Vested (in shares) (0.3) (0.2) (0.1)  
Forfeited (in shares) (0.2) (0.1) (0.1)  
Balance at the end of the period (in shares) 1.3 1.6 1.2 0.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Balance at the beginning of the period (in dollars per share) $ 41.01 $ 43.28 $ 43.10  
Granted (in dollars per share) 22.02 37.74 44.23  
Vested (in dollars per share) 46.31 43.06 42.78  
Forfeited (in dollars per share) 41.17 42.43 44.78  
Balance at the end of the period (in dollars per share) $ 37.17 $ 41.01 $ 43.28 $ 43.10
Aggregate Intrinsic Value $ 28.3 $ 43.9 $ 55.7 $ 28.0
Weighted Average Remaining Vesting Term 1 month 1 year 4 months 24 days 1 year 7 months 6 days 1 year 8 months 12 days
Aggregate intrinsic value of awards issued $ 5.8 $ 7.7 $ 6.2  
SSAR Awards        
Awards Outstanding        
Balance at the beginning of the period (in shares) 0.7 0.3 0.2  
Granted (in shares) 1.2 0.4 0.1  
Exercised (in shares) 0.0 0.0 0.0  
Forfeited (in shares) (0.4) 0.0    
Balance at the end of the period (in shares) 1.5 0.7 0.3 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Balance at the beginning of the period (in dollars per share) $ 40.27 $ 44.97 $ 42.91  
Granted (in dollars per share) 27.08 36.31 48.58  
Exercised (in dollars per share) 0 0 40.91  
Forfeited (in dollars per share) 38.53 40.91    
Balance at the end of the period (in dollars per share) $ 29.75 $ 40.27 $ 44.97 $ 42.91
Aggregate Intrinsic Value $ 0.0 $ 0.0 $ 0.3 $ 0.0
Weighted Average Remaining Vesting Term 4 years 3 years 2 years 4 months 24 days 2 years 6 months
SSAR Awards Exercisable        
SSAR Awards (in shares) 0.0 0.2 0.2 0.1
Weighted Average Exercise Price (in dollars per share) $ 57.48 $ 42.76 $ 42.15 $ 42.06
Aggregate Intrinsic Value $ 0.0 $ 0.0 $ 0.7 $ 0.0
Weighted Average Remaining Contractual Life 1 year 2 months 12 days 12 days 1 year 3 months 18 days 2 years 2 months 12 days
Aggregate intrinsic value of SSAR Awards exercised $ 0.0 $ 0.0    
Assumptions used to determine weighted average fair value        
Weighted average fair value of SSAR Awards (in dollars per share) $ 6.56 $ 8.82 $ 12.32  
Expected term 4 years 6 months 4 years 3 months 18 days 4 years 6 months  
Volatility 30.80% 28.60% 29.80%  
Dividend yields 1.00% 0.70% 0.51%  
Risk-free interest rates 2.60% 1.80% 1.20%