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Balance Sheet Accounts and Supplemental Disclosures - Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 161.6 $ 161.6  
Accumulated Amortization 116.8 103.4  
Net Carrying Amount 44.8 58.2  
Amortization expense 13.4 13.6 $ 13.7
Customer related      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 87.2 87.2  
Accumulated Amortization 75.3 65.9  
Net Carrying Amount 11.9 21.3  
Intellectual property\trade secrets      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 34.2 34.2  
Accumulated Amortization 19.7 17.1  
Net Carrying Amount 14.5 17.1  
Trade name      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 21.0 21.0  
Accumulated Amortization 5.4 4.6  
Net Carrying Amount 15.6 16.4  
Acquired technology      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 19.2 19.2  
Accumulated Amortization 16.4 15.8  
Net Carrying Amount $ 2.8 $ 3.4