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Leases - Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Finance lease cost:    
Amortization of right-of-use assets $ 0.2 $ 0.8
Interest on lease liabilities 0.1 0.0
Net finance lease cost 0.3 0.8
Operating lease cost 23.5 21.7
Variable lease cost 0.6 0.5
Sublease income (0.7) (0.5)
Total lease cost $ 23.7 $ 22.5