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Equity - Non-Vested Restricted Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-Based Compensation [Line Items]      
Requisite service and perfromance period 3 years    
Additional share based compensation information      
Future Allocated Share-based Compensation Expense Next Twelve Months $ 15.7    
Future Allocated Share-based Compensation Expense Year Two 6.0    
Future Allocated Share-based Compensation Expense Year Three 1.0    
Amortization of share-based compensation 44.2 $ 16.3 $ 27.9
Share-based compensation, tax benefit 17.2 6.4 10.9
Excess tax benefit from share-based compensation, operating activities 3.0    
Excess tax benefits from share-based compensation, financing activities 0.0 4.7 5.6
Proceeds from issuance of common stock 2.8 $ 5.3 $ 11.8
Additional paid-in capital      
Additional share based compensation information      
Unrecognized stock-based compensation expense $ 22.7    
PSUs      
Share-Based Compensation [Line Items]      
Award performance based award earned Percent 160.00% 60.00%  
Shares      
Non-vested at the beginning of the period (in shares) 0.7    
Granted (in shares) 0.3    
Vested (in shares) (0.2)    
Forfeited (in shares) (0.3)    
Non-vested at the end of the period (in shares) 0.5 0.7  
Weighted Average Grant Date Fair Value      
Non-vested at the beginning of the period (in dollars per share) $ 51.11    
Granted (in dollars per share) 58.90    
Vested (in dollars per share) 46.54    
Forfeited (in dollars per share) 54.13    
Non-vested at the end of the period (in dollars per share) 54.79 $ 51.11  
Restricted stock awards      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 59.10 $ 53.75 $ 54.42
Additional share based compensation information      
Fair value of restricted stock awards vested $ 22.6 $ 30.2 $ 9.6
RSUs      
Share-Based Compensation [Line Items]      
Award performance based award earned Percent 100.00% 100.00%  
Shares      
Non-vested at the beginning of the period (in shares) 0.5    
Granted (in shares) 0.3    
Vested (in shares) (0.3)    
Forfeited (in shares) 0.0    
Non-vested at the end of the period (in shares) 0.5 0.5  
Weighted Average Grant Date Fair Value      
Non-vested at the beginning of the period (in dollars per share) $ 52.79    
Granted (in dollars per share) 59.27    
Vested (in dollars per share) 52.39    
Forfeited (in dollars per share) 56.45    
Non-vested at the end of the period (in dollars per share) $ 56.76 $ 52.79  
Additional paid-in capital      
Additional share based compensation information      
Amortization of share-based compensation $ 44.2 $ 16.3 $ 27.9
Minimum      
Share-Based Compensation [Line Items]      
Award performance based award earned Percent 0.00%    
Maximum      
Share-Based Compensation [Line Items]      
Award performance based award earned Percent 200.00%