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Leases - Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating leases:    
Operating lease cost $ 2.3 $ 2.4
Short-term leases:    
Total lease expense 8.7 11.7
Cost of products sold and operating expenses    
Operating leases:    
Operating lease cost 1.8 1.9
Short-term leases:    
Cost of products sold and operating expenses 6.4 9.3
Selling, general and administrative expenses    
Operating leases:    
Operating lease cost $ 0.5 $ 0.5