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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 6 Months Ended
Oct. 31, 2020
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dividends Payable [Line Items]                
Reserve for stock issuance (in shares)   12.0       12.0    
Additional shares authorized for repurchase, value $ 2,000.0              
Stock repurchased and pending settlement (in shares)   0.0   0.5   0.0 0.5  
Stock repurchased and pending settlement       $ 52.1     $ 52.1  
Remaining authorized repurchase amount   $ 1,500.0       $ 1,500.0    
Quarterly dividend declared (in dollars per share)   $ 0.460   $ 0.425   $ 0.920 $ 0.850  
Cash dividends declared   $ 145.3 $ 145.3 $ 135.4 $ 135.6      
Quarterly dividend payable   $ 145.3       $ 145.3   $ 145.9
Antidilutive securities (in shares)   0.1   0.1   0.1 0.1  
Retained Earnings                
Dividends Payable [Line Items]                
Cash dividends declared   $ 145.3 $ 145.3 $ 135.4 $ 135.6 $ 290.6