Selected Quarterly Data - Narrative (Details) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Purchase Accounting Expense	$ 0.9	$ 2.5	$ 0.5
Restructuring Charges	0.1	0.3		$ 1.2			$ 0.4	$ 1.7	$ 0.4	$ 0.0
Decrease in valuation allowance	2.2									3.5
Income tax benefit					$ 1.4			(17.4)	(34.1)	(23.7)
Benefit associated with tax planning strategy					4.2				(4.2)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 0.2	$ 0.4	$ 0.4	$ 0.5	2.4				2.4
Income tax expense of discontinued operations					$ 6.3	$ 1.5		$ 3.4	$ 8.3	$ 1.0