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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' equity $ 10,765.7 $ 10,479.8 $ 9,591.3 $ 9,491.9
Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' equity $ 8,776.0 8,546.2 $ 8,003.1 7,818.0
Cumulative Effect, Period Of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' equity       (1.7)
Cumulative Effect, Period Of Adoption, Adjustment | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' equity   $ (1.7)   $ (1.7)