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Restructuring Activities - Restructuring 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        
Severance costs $ 0.4 $ 1.3 $ 0.7 $ 10.0
Other restructuring costs 1.5 0.6 2.2 2.7
Total restructuring costs 1.9 1.9 2.9 12.7
Cost of sales        
Restructuring Cost and Reserve        
Severance costs 0.4 0.6 0.4 4.5
Other restructuring costs 1.5 0.6 2.2 0.6
Selling, general, and administrative expenses        
Restructuring Cost and Reserve        
Severance costs 0.0 0.7 0.3 5.5
Other restructuring costs $ 0.0 $ 0.0 $ 0.0 $ 2.1