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Insurance Liabilities - Liability for Unpaid Claims (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Change in unpaid claims    
Balance at beginning of period, unpaid claims $ 2,659.4 $ 2,534.9
Balance at beginning of period, reinsurance recoverables for unpaid claims 442.1 436.9
Net balance at beginning of period, unpaid claims 2,217.3 2,098.0
Incurred:    
Incurred: Current year 806.7 748.7
Incurred: Prior years 40.0 33.3
Total incurred 846.7 782.0
Payments:    
Payments: Current year 480.5 454.4
Payments: Prior years 298.1 272.1
Total payments 778.6 726.5
Net balance at end of period, unpaid claims 2,285.4 2,153.5
Balance at end of period, reinsurance recoverables for unpaid claims 464.6 437.8
Balance at end of period, unpaid claims 2,750.0 2,591.3
Amount not included in the rollforward above:    
Claim adjustment expense liabilities $ 60.0 $ 59.1