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Stock Repurchases, Dividends and Earnings per Share - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2018
Oct. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Equity [Abstract]            
Stock repurchased and pending settlement (in shares)     0.2 0.2    
Stock repurchased and pending settlement, liability     $ 14.9 $ 10.9    
Additional shares authorized for repurchase, value   $ 2,000.0        
Remaining authorized repurchase amount     $ 1,600.0     $ 98.4
Quarterly dividend declared (in dollars per share) $ 0.345   $ 0.345 $ 0.32    
Cash dividends declared     $ 113.3      
Quarterly dividend payable     $ 113.3   $ 114.4