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Reinsurance - Effects Of Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Premiums and other considerations:      
Premiums and other considerations, Direct $ 6,962.2 $ 5,796.1 $ 5,492.1
Premiums and other considerations, Ceded (491.3) (456.4) (650.6)
Net premiums and other considerations 6,470.9 5,339.7 4,841.5
Benefits, claims and settlement expenses:      
Benefits, claims and settlement expenses, Direct 9,365.4 8,103.6 7,833.4
Benefits, claims and settlement expenses, Ceded (1,577.2) (1,472.3) (575.2)
Net benefits, claims and settlement expenses 7,788.2 6,631.3 7,258.2
Liability for future policy benefits remeasurement (gain) loss:      
Liability for future policy benefits remeasurement (gain) loss, Direct 737.4 (179.5) (6.4)
Liability for future policy benefits remeasurement (gain) loss, Ceded (789.0) (85.0) 2.0
Net liability for future policy benefits remeasurement (gain) loss $ (51.6) $ (264.5) $ (4.4)