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Shareholders' Equity (Share Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]        
Aggregate purchase price   $ 499.0 $ 237.3 $ 487.7
Stock Repurchase Program Board Authorized Repurchases [Member]        
Class of Stock [Line Items]        
Shares repurchased (in shares)   10.5 3.9 9.4
Aggregate purchase price   $ 497.0 $ 235.1 $ 485.1
Average purchase price per share (in dollars per share)   $ 47.30 $ 60.49 $ 51.59
Remaining amount available for share repurchase   $ 298.6    
Treasury Shares Retirement [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Retired 43.0