Income Taxes Uncertain Tax Provisions (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods	$ 21.0
Effective income tax rate reconciliation, resolution of Advanced Pricing Agreement, amount		$ (85.8)	$ (14.5)
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Gross unrecognized tax benefits, beginning of period	27.1	98.6	100.6
Prior year tax positions - increases	1.9	13.5	18.4
Current year tax positions	8.5	6.9	1.1
Prior year tax positions - decreases	0.0	(91.6)	(20.2)
Settlements with taxing authorities	0.0	0.0	0.0
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	1.8
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation		(0.3)	(1.3)
Gross unrecognized tax benefits, end of period	39.3	27.1	$ 98.6
Accrued interest and penalties related to unrecognized tax benefits, which are reflected in other noncurrent liabilities	4.1	$ 3.2
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	8.2
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Prior year tax positions - increases	$ 10.7