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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. Federal statutory rate $ 153.3 $ 137.5 $ 127.8
Impacts of Tax Cuts and Jobs Act Enactment 0.0 0.0 7.8
Foreign earnings subject to different tax rates (127.6) (137.7) (154.9)
State and local income taxes, less federal income tax benefit 2.7 (2.9) 1.4
Research and development and miscellaneous tax credits (6.2) (3.8) (3.7)
Tax on dividends, deemed dividends, and GILTI 46.5 46.8 45.5
Changes to unrecognized tax benefits 5.8 (5.4) 2.7
Nondeductible expenses 5.5 3.5 12.4
Change in valuation allowance 52.1 49.9 7.4
Exchange gains and losses (2.1) (2.1) 5.7
Other 20.9 25.7 18.7
Total 150.9 111.5 70.8
Tax expense associated with GILTI provision $ 40.7 $ 41.6 $ 43.8