Income Taxes Income Taxes - Rollforward of Deferred Tax Assets Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	$ 135.7	$ 147.1	$ 135.3
Deferred Tax Asset Valuation Allowance, Change in Assessment	(0.3)	(7.4)	2.5
Deferred Tax Asset Valuation Allowance, Current Year Operations	(22.1)	(4.0)	9.3
Deferred Tax Assets, Valuation Allowance, Ending Balance	113.3	135.7	147.1
Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	0.0	0.0	0.0
Deferred Tax Asset Valuation Allowance, Change in Assessment	0.0	0.0	0.0
Deferred Tax Asset Valuation Allowance, Current Year Operations	0.0	0.0	0.0
Deferred Tax Assets, Valuation Allowance, Ending Balance	0.0	0.0	0.0
State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	41.5	45.0	44.7
Deferred Tax Asset Valuation Allowance, Change in Assessment	0.0	0.0	0.0
Deferred Tax Asset Valuation Allowance, Current Year Operations	4.4	(3.5)	0.3
Deferred Tax Assets, Valuation Allowance, Ending Balance	45.9	41.5	45.0
Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance, Beginning Balance	94.2	102.1	90.6
Deferred Tax Asset Valuation Allowance, Change in Assessment	(0.3)	(7.4)	2.5
Deferred Tax Asset Valuation Allowance, Current Year Operations	(26.5)	(0.5)	9.0
Deferred Tax Assets, Valuation Allowance, Ending Balance	$ 67.4	$ 94.2	$ 102.1