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Selected Quarterly Data - Narrative (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Restructuring Charges			$ 0.4				$ 0.4	$ 0.0	$ 0.7
Debt agreement termination costs						$ 8.7
Decrease in valuation allowance	$ (3.5)			$ (6.7)	$ (102.4)
Income tax benefit	1.4			$ 3.5			(34.1)	(23.7)	108.6
Benefit associated with tax planning strategy	4.2						4.2
Adjustment of deferred tax assets	2.4						2.4
Income tax expense of discontinued operations	$ 6.3	$ 1.5					$ 8.3	$ 0.9	$ 0.6

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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