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Income Taxes Tax Cuts and Jobs Act of 2017 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax [Line Items]    
Total impact of the Tax Act   $ (77.2)
Benefit to tax expense due to reduction of DTL recorded for non-US earnings considered not permanently invested   (275.8)
Tax expense related to non-United States withholding tax   5.5
Transition tax expense   $ 170.2
Transition tax expense payment period   8 years
Transition tax expense, annual percentage due for the first five years   8.00%
Transition tax expense, annual percentage due in year six   15.00%
Transition tax expense, annual percentage due in year seven   20.00%
Transition tax expense, annual percentage due in year eight   25.00%
Tax expense from certain foreign tax credit benefits disallowed   $ 3.8
Impact on net deferred assets and liabilities, excluding the provision for unremitted earnings   1.2
Impact on prior year unrecognized tax benefits   $ 23.4
United States    
Income Tax [Line Items]    
Statutory rate   35.00%
Scenario, Forecast | United States    
Income Tax [Line Items]    
Statutory rate 21.00%