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Leases - Schedule of Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Lease cost $ 2.7 $ 1.6 $ 7.2 $ 5.7
Less: sublease income 0.1 0.1 0.3 0.3
Net lease cost $ 2.6 $ 1.5 $ 6.9 $ 5.4