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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Finance lease cost:    
Amortization of right-of-use assets $ 0.3 $ 0.3
Net finance lease cost 0.3 0.3
Operating lease cost 3.5 3.5
Variable lease cost 0.1 0.1
Total lease cost $ 3.9 $ 3.9