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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Provision for income taxes at United States federal statutory rate $ 198.3 $ 118.0 $ 54.8
State and local income taxes, net of federal income tax effects 2.2 (3.5) (2.5)
Taxes on foreign income which differ from the United States statutory rate 16.2 13.9 6.7
Tax effect of permanent differences (6.4) 13.4 63.9
Change in valuation allowance (130.8) 16.3 84.6
Change in tax contingency reserves 36.6 37.2 3.2
Research and development tax credits (7.4) (9.0) (7.1)
Impacts related to changes in tax laws 0.0 0.0 (21.8)
Other (0.3) 1.4 (1.0)
Income tax provision $ 108.4 $ 187.7 $ 180.8