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Disposition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Mar. 31, 2026
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Reinsurance recoverable $ 6,542.0 $ 6,471.3   $ 6,542.0
Future policy benefits and expenses 54.7 55.7   54.7
Loss on sale of business $ 0.5 10.7 $ 0.0 $ 11.2
Disposal Group, Held-for-Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Reinsurance recoverable   489.4    
Future policy benefits and expenses   $ 477.1