Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net deferred tax liability	$ 3.1	$ 3.5
Income tax receivable	9.1	2.3
Net operating loss carryforwards	741.5
Foreign tax credit carryforwards, subject to expriration	7.8
Alternative Minimum Tax	0.9
Valuation allowance	461.7	470.5
Deferred income tax expense (benefit)	11.7
Unrecognized tax benefits that would impact effective tax rate	10.9	7.6
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.6	2.0
Interest accrual reversal	1.5	3.3
Interest accrued net reduction	0.9	1.3
Total amount of interest accrued for uncertain tax positions	2.2	$ 3.1
Amount by which unrecognized tax benefits may decrease over the next 12 months	$ 0.9