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Insurance Liabilities - Liability for Unpaid Claims (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Change in unpaid claims    
Balance at beginning of period, unpaid claims $ 2,365.5 $ 2,252.7
Balance at beginning of period, reinsurance recoverables for unpaid claims 403.8 404.3
Net balance at beginning of period, unpaid claims 1,961.7 1,848.4
Incurred:    
Incurred: Current year 324.8 325.5
Incurred: Prior years 19.5 25.1
Total incurred 344.3 350.6
Payments:    
Payments: Current year 168.7 162.9
Payments: Prior years 166.3 157.6
Total payments 335.0 320.5
Net balance at end of period, unpaid claims 1,971.0 1,878.5
Balance at end of period, reinsurance recoverables for unpaid claims 413.9 397.5
Balance at end of period, unpaid claims 2,384.9 2,276.0
Amount not included in the rollforward above:    
Claim adjustment expense liabilities $ 58.0 $ 54.7