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Shareholders' Equity - Share Repurchases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Oct. 29, 2015
Dec. 12, 2012
Equity, Class of Treasury Stock [Line Items]        
Stock repurchased during period (in shares) 1,500,000 500,000    
Repurchases of common stock $ 117.7 $ 39.6    
Common Stock Repurchase 2015 Authorization        
Equity, Class of Treasury Stock [Line Items]        
Number of shares authorized to be repurchased (in shares)     6,000,000  
Number of shares remaining authorized for repurchase 3,800,000      
Common Stock Repurchase 2012 Authorization        
Equity, Class of Treasury Stock [Line Items]        
Number of shares authorized to be repurchased (in shares)       8,000,000
Number of shares remaining authorized for repurchase 0