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Leases - Lease Cost and Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Lease costs:    
Operating lease cost $ 8.7 $ 11.5
Short-term and variable lease costs 0.5 0.7
Cash flows:    
Operating cash flows from operating leases $ 8.5 $ 11.5
Weighted average remaining lease term (in years) 6 years 10 months 24 days 5 years 10 months 24 days
Weighted average discount rate 3.30% 3.40%