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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

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