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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Statement of Financial Position [Abstract]    
Fixed maturity securities, allowances for credit losses $ 2.8 $ 1.9
Fixed maturity securities available for sale, amortized cost 8,956.7 8,635.3
Commercial mortgage loans on real estate, allowances for expected credit losses 6.3 6.7
Premiums and accounts receivable, allowances for expected credit losses 12.4 10.4
Reinsurance recoverables, allowances for expected credit losses 5.2 5.2
Other assets, allowances for expected credit losses 0.9 0.9
Accounts payable and other liabilities, allowances for credit losses $ 0.7 $ 0.9
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares, issued (in shares) 51,967,256 52,089,008
Common stock, shares outstanding (in shares) 49,671,167 49,792,919
Treasury stock, at cost (in shares) 2,296,089 2,296,089