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Other Assets - Summary of Other Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 11.5 $ 17.4
Claims receivable 11.2 9.0
Lease right-of-use assets 14.6 27.6
Property and equipment 35.1 5.4
Other 6.6 4.2
Total other assets $ 79.0 $ 63.6