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Income Taxes, Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. Federal [Abstract]        
Current   $ 12.2 $ 1.3 $ 30.3
Noncurrent Federal Tax Expense   122.2 0.0 0.0
Deferred   (9.2) (11.1) 17.8
Total U.S. Federal   125.2 (9.8) 48.1
State and Local [Abstract]        
Current   5.4 8.2 5.3
Noncurrent State and Local Tax Expense (Benefit)   19.1 0.0 0.0
Deferred   (7.4) (4.0) 1.9
Total State and Local   17.1 4.2 7.2
International [Abstract]        
Current   141.2 105.4 81.9
Deferred   (15.7) 8.2 (4.4)
Total International   125.5 113.6 77.5
Total provision for income taxes   $ 267.8 $ 108.0 $ 132.8
U.S. federal income tax rate 21.00% 35.00% 35.00% 35.00%
Increase or decrease in current tax expense from utilization of prior years' net operating loss carryovers   $ 3.0 $ (21.8) $ 16.8