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Restructuring and Impairment Activities - Restructuring and related charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense $ 6.0 $ 1.6 $ 7.7 $ 2.0
Accelerated depreciation and amortization 1.2 0.0 1.2 0.0
Spare parts and consignment inventory write-down to estimated net realizable value 2.0 0.0 2.0 0.0
Total other restructuring related charges - Cost of products sold 3.2 0.0 3.2 0.0
Total restructuring costs and related charges 9.2 1.6 10.9 2.0
Severance        
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense 5.7 0.6 7.4 1.0
Other        
Restructuring Cost and Reserve [Line Items]        
Total restructuring and impairment expense $ 0.3 $ 1.0 $ 0.3 $ 1.0