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Commitments and Contingencies - Environmental, Health, and Safety (EHS) Matters (Details) - EHS $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) landfill	Dec. 31, 2016 USD ($) landfill	Aug. 01, 2016 USD ($)
Environmental, Health, and Safety ("EHS") Matters
Environmental accruals			$ 3.9	$ 4.8
Environmental accruals included in other current liabilities			1.3	0.2
Estimated closure and post-closure costs			$ 0.4	$ 0.4
Number of landfills | landfill			2	2
CRCT
Environmental, Health, and Safety ("EHS") Matters
Estimate of possible loss					$ 0.5
Payments for legal settlements	$ 0.3	$ 0.2
Revised civil penalty	$ 0.5

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