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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating lease cost:      
Amortization of right-of-use assets $ 4.0 $ 5.6 $ 5.6
Interest on lease liabilities 0.8 1.1 1.3
Total operating lease cost $ 4.8 $ 6.7 $ 6.9