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Stock Repurchases, Dividends and Earnings per Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Feb. 29, 2020
Oct. 31, 2017
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Equity [Abstract]          
Reserve for stock issuance (in shares)     12,300,000    
Stock repurchased and pending settlement (in shares)     0 0  
Additional shares authorized for repurchase, value   $ 2,000.0      
Remaining authorized repurchase amount     $ 605.8    
Quarterly dividend declared (in dollars per share) $ 0.405   $ 0.405 $ 0.375  
Cash dividends declared     $ 128.9 $ 120.7  
Quarterly dividend payable     $ 128.9   $ 129.2
Antidilutive securities (in shares)     100,000 0