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Restructuring and Impairment Activities - Restructuring and Related Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense $ 1.9 $ 6.0 $ 5.9 $ 7.7
Accelerated depreciation and amortization 0.1 1.2 0.1 1.2
Spare parts and inventory write-downs to estimated net realizable value 0.4 2.0 0.4 2.0
Total other restructuring related charges - Cost of products sold 0.5 3.2 0.5 3.2
Total restructuring costs and related charges 2.4 9.2 6.4 10.9
Severance        
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense 1.2 5.7 2.8 7.4
Other        
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense $ 0.7 $ 0.3 $ 3.1 $ 0.3