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Leasing - Components of Lease Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of lease expense [Line Items]      
Amortization of right-of-use assets $ 1.8 $ 1.0  
Interest on lease liabilities 0.4 0.3  
Total finance lease cost 2.2 1.3  
Operating lease cost 32.7 28.9  
Short-term lease cost 3.0 5.9  
Variable lease cost 2.9 7.2  
Total lease cost 40.8 43.3  
Cost of Sales [Member]      
Components of lease expense [Line Items]      
Lease expense 28.4 31.9 $ 28.4
Selling, General and Administrative Expenses [Member]      
Components of lease expense [Line Items]      
Lease expense $ 10.2 $ 10.1 $ 10.0