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Accounting Policies and Basis of Presentation - Narrative (Details) $ in Millions		9 Months Ended
	Nov. 17, 2017	Sep. 30, 2018 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of reportable segments | segment		3
Stockholders' equity reverse stock split, conversion ratio	0.25
Restricted cash		$ 0.0		$ 3.8
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]		us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents		us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Other current assets		$ 55.6		$ 56.5
Property, plant and equipment, net		$ 283.9		$ 303.7
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets			$ (8.8)
Property, plant and equipment, net			$ 8.8

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