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Basis of Presentation - Reporting and Accounting Policies - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Premium Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses, beginning of period $ 343.9 $ 265.8 $ 343.3 $ 280.4
Increase in allowance 157.5 130.9 399.7 320.6
Write-offs (140.2) (101.7) (381.8) (306.0)
Allowance for credit losses, end of period $ 361.2 $ 295.0 $ 361.2 $ 295.0