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Restructuring Activities - Restructuring Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve        
Severance costs $ 1.9 $ 0.8 $ 2.8 $ 2.7
Other restructuring costs 0.1 1.5 0.7 5.8
Restructuring costs 2.0 2.3 3.5 8.5
Cost of sales        
Restructuring Cost and Reserve        
Severance costs 0.0 0.0 0.2 0.4
Other restructuring costs 0.0 0.3 0.5 1.9
Selling, general, and administrative expenses        
Restructuring Cost and Reserve        
Severance costs 1.9 0.8 2.6 2.3
Other restructuring costs $ 0.1 $ 1.2 $ 0.2 $ 3.9