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Income Taxes Uncertain Tax Provisions (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods $ 20.5    
Effective income tax rate reconciliation, resolution of Advanced Pricing Agreement, amount     $ (85.8)
Changes in unrecognized tax benefits for all jurisdictions were as follows:      
Gross unrecognized tax benefits, beginning of period 39.3 $ 27.1 98.6
Prior year tax positions - increases 0.3 1.9 13.5
Current year tax positions 3.8 8.5 6.9
Prior year tax positions - decreases (2.9) 0.0 (91.6)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation   1.8  
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation (2.4)   (0.3)
Gross unrecognized tax benefits, end of period 38.1 39.3 $ 27.1
Accrued interest and penalties related to unrecognized tax benefits, which are reflected in other noncurrent liabilities 4.9 $ 4.1  
Non-US      
Income Tax Contingency [Line Items]      
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods 0.7    
Changes in unrecognized tax benefits for all jurisdictions were as follows:      
Prior year tax positions - increases $ 1.2