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Income Taxes, Provision and Effective tax rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes        
Provision for income taxes $ (120.5) $ (99.3) $ (302.8) $ (213.3)
Effective tax rate 22.20% 22.10% 21.20% 20.00%
Discrete income tax benefit, tax on foreign income       $ 19.9
Discrete income tax benefit, impact on effective tax rate       (1.90%)
Tax settlement, amount     $ (14.9)  
Tax settlement, effective tax rate     (1.00%)  
Excess tax benefit from option exercises $ 12.3 $ 10.7 $ 34.3 $ 28.1
Excess tax benefit, impact on effective tax rate (2.30%) (2.40%) (2.40%) (2.60%)
Impact of acquisition-related expenses on the effective tax rate     0.20%