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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 6 Months Ended
Apr. 30, 2019
Oct. 31, 2017
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 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   200,000   100,000 200,000  
Stock repurchased and pending settlement, liability     $ 0.9   $ 10.3   $ 0.9 $ 10.3  
Additional shares authorized for repurchase, value   $ 2,000.0              
Remaining authorized repurchase amount     $ 901.6       $ 901.6    
Quarterly dividend declared (in dollars per share) $ 0.375   $ 0.375   $ 0.345   $ 0.750 $ 0.690  
Cash dividends declared     $ 120.2 $ 120.7 $ 112.4 $ 113.3 $ 240.9    
Quarterly dividend payable     $ 120.2       $ 120.2   $ 121.0
Antidilutive securities (in shares)     0   0   0 0