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Restructuring and Related Activities - Restructuring And Related Charges (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment expense	$ 4.2	$ 6.0	$ 1.6	$ 0.1	$ 1.7	$ 1.6	$ 0.4	$ 0.0	$ 11.9	$ 3.7	$ 1.7
Accelerated depreciation and amortization									2.9	0.0	0.0
Spare parts and consignment inventory write-down to estimated net realizable value									2.0	0.0	0.0
Total other restructuring related charges - Cost of products sold									4.9	0.0	0.0
Total restructuring costs and related charges									16.8	3.7	1.7
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment expense									11.6	2.6	1.3
Other
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment expense									$ 0.3	$ 1.1	$ 0.4

X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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