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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Provision for income taxes at United States federal statutory rate   $ 54.8 $ 75.7 $ 99.3
State and local income taxes, net of federal income tax effects   (2.5) (6.0) (5.7)
Taxes on foreign income which differ from the United States statutory rate   6.7 (0.3) (57.7)
Tax effect of permanent differences   63.9 26.7 60.6
Change in valuation allowance   84.6 24.6 (1.4)
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) $ 42.0      
Change in tax contingency reserves   3.2 8.5 3.8
Research and development tax credits   (7.1) (8.5) (5.0)
Impacts related to changes in tax laws   (21.8) (8.4) 42.0
Other   (1.0) (1.4) (2.3)
Income tax provision   $ 180.8 $ 110.9 $ 133.6