Income Taxes Rollforward of Deferred Tax Assets Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 135.3	$ 536.7	$ 480.4
Deferred Tax Asset Valuation Allowance, Change in Assessment	2.5	(370.9)	(6.5)
Deferred Tax Asset Valuation Allowance, Current Year Operations	9.3	(30.5)	62.8
Deferred Tax Assets, Valuation Allowance	147.1	135.3	536.7
Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	0	352.8	327.0
Deferred Tax Asset Valuation Allowance, Change in Assessment	0	(339.6)	0
Deferred Tax Asset Valuation Allowance, Current Year Operations	0	(13.2)	25.8
Deferred Tax Assets, Valuation Allowance	0	0	352.8
State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	44.7	122.4	127.5
Deferred Tax Asset Valuation Allowance, Change in Assessment	0	(35.0)	0
Deferred Tax Asset Valuation Allowance, Current Year Operations	0.3	(42.7)	(5.1)
Deferred Tax Assets, Valuation Allowance	45.0	44.7	122.4
Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	90.6	61.5	25.9
Deferred Tax Asset Valuation Allowance, Change in Assessment	2.5	3.7	(6.5)
Deferred Tax Asset Valuation Allowance, Current Year Operations	9.0	25.4	42.1
Deferred Tax Assets, Valuation Allowance	$ 102.1	$ 90.6	$ 61.5