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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 9 Months Ended
Jul. 31, 2019
Oct. 31, 2017
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Equity [Abstract]                      
Reserve for stock issuance (in shares)     12,800,000           12,800,000    
Stock repurchased and pending settlement (in shares)     100,000     0     100,000 0  
Stock repurchased and pending settlement, liability     $ 0.1           $ 0.1    
Additional shares authorized for repurchase, value   $ 2,000.0                  
Remaining authorized repurchase amount     $ 750.3           $ 750.3    
Quarterly dividend declared (in dollars per share) $ 0.405   $ 0.405     $ 0.375     $ 1.155 $ 1.065  
Cash dividends declared     $ 129.3 $ 120.2 $ 120.7 $ 121.7 $ 112.4 $ 113.3 $ 370.2    
Quarterly dividend payable     $ 129.3           $ 129.3   $ 121.0
Antidilutive securities (in shares)     0     0     0 0