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Commitments and Contingencies - Operating Lease Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 7.0    
2019 6.6    
2020 5.1    
2021 4.5    
2022 4.1    
Thereafter 15.4    
Operating leases, future minimum payments due 42.7    
Operating leases, rent expense 5.1 $ 4.8 $ 3.2
Commitments      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 5.6    
2019 5.2    
2020 4.0    
2021 3.5    
2022 3.1    
Thereafter 13.4    
Operating leases, future minimum payments due 34.8    
Related Entity      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 1.4    
2019 1.4    
2020 1.1    
2021 1.0    
2022 1.0    
Thereafter 2.0    
Operating leases, future minimum payments due $ 7.9    
Ownership percentage in partnership 50.00%