Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Net deferred tax liability	$ 3.5	$ 1.4
Income tax receivable	2.3	4.5
Net operating loss carryforwards	700.2
Deferred tax assets, net of valuation allowance, noncurrent	465.5
Foreign tax credit carryforwards, subject to expriration	13.2
Valuation allowance	470.5	494.5
Deferred income tax expense (benefit)	11.7		$ 41.7
Unrecognized tax benefits that would impact effective tax rate	7.6	11.6
Unrecognized Tax Benefits, Interest on Income Taxes Expense	2.0	1.1
Interest accrual reversal	3.3	11.2
Interest accrued net reduction	1.3	10.1
Total amount of interest accrued for uncertain tax positions	3.1	$ 4.4
Amount by which unrecognized tax benefits may decrease over the next 12 months	3.2
State and Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Tax paid to settle audits of tax years 2006-11 for certain subsidiaries	1.1
Interest paid to settle audits of tax years 2006-11 for certain subsidiaries	$ 0.1