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Basis of Presentation and Significant Accounting Policies - Property and Equipment Included in Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Property and Equipment    
Property and equipment $ 148.3 $ 136.4
Less: accumulated depreciation 79.0 70.4
Total $ 69.3 $ 66.0