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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating ROU assets $ 10.8 $ 12.4
Operating ROU assets, extensible list us-gaap:OtherAssets  
Operating lease liabilities extensible list us-gaap:LiabilitiesAbstract us-gaap:LiabilitiesAbstract
Total operating lease liabilities $ 10.2 $ 11.7
Accrued liabilities    
Lessee, Lease, Description [Line Items]    
Current operating lease liabilities 2.0 1.9
Other deferred credits and liabilities    
Lessee, Lease, Description [Line Items]    
Noncurrent operating lease liabilities $ 8.2 $ 9.8