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Income Taxes, Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S. Federal [Abstract]      
Current $ 16.4 $ 38.2 $ 39.8
Noncurrent Federal Tax Expense 0.0 0.7 35.7
Deferred 3.8 (12.9) (20.1)
Total U.S. Federal 20.2 26.0 55.4
State and Local [Abstract]      
Current 12.5 15.1 12.5
Noncurrent State and Local Tax Expense (Benefit) 0.0 0.0 7.5
Deferred 0.2 (7.0) (5.0)
Total State and Local 12.7 8.1 15.0
International [Abstract]      
Current 103.7 156.9 145.3
Deferred (29.7) (31.3) (1.4)
Total International 74.0 125.6 143.9
Total provision for income taxes $ 106.9 $ 159.7 $ 214.3
U.S. federal income tax rate 21.00% 21.00% 21.00%
Increase or decrease in current tax expense from utilization of prior years' net operating loss carryovers $ 2.9 $ (0.3) $ 22.2