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Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Income tax at statutory rate	$ (22.5)	$ (1.7)	$ 54.9
Foreign taxes	1.9	0.8	2.2
State and local income taxes, net of federal income tax	0.9	11.2	4.5
Federal and foreign	0.5	3.2	(0.3)
Enactment of the 2017 Tax Act		0.0	0.0
Finalization of estimates from Spin-Off	(0.9)	0.0	0.0
Change in valuation allowance	2.8	1.3	3.8
Benefit from sale of non-U.S. operations	0.0	0.0	(20.4)
All other items, net	(0.3)	0.0	0.9
Total income tax (benefit) provision	(224.7)	14.8	$ 45.6
State
Income Tax Contingency [Line Items]
Enactment of the 2017 Tax Act	13.5
Federal
Income Tax Contingency [Line Items]
Enactment of the 2017 Tax Act	$ (207.1)	$ 7.3

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Effective Income Tax Rate Reconciliation, Spin-Off Related Adjustments, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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