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Commitments and Contingencies - Estimated Future Payments (Details) - EHS - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Estimated future payments for environmental obligations
2018	$ 2.9
2019	1.1
2020	0.0
2021	0.0
2022	0.0
Thereafter	0.0
Undiscounted total	4.0
Less amounts representing interest at 1.98%	0.1
Accrued environmental liabilities at December 31, 2017	$ 3.9	$ 4.8
Interest rate	1.98%

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of imputed interest necessary to reduce (reconcile) the undiscounted amount of the accrual for environmental loss contingencies to the present value.

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Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

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Undiscounted amount of the accrual for environmental loss contingencies expected to be paid after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Undiscounted amount of the accrual for environmental loss contingencies expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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