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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Fixed maturities, at amortized cost $ 6,929,600,000 $ 6,692,700,000
Fixed maturities, allowance for credit losses (4,600,000) (3,300,000)
Equity securities, at cost 680,600,000 684,100,000
Premium receivables, allowance for credit losses 11,300,000 20,900,000
Long-term Debt $ 1,213,300,000 $ 1,247,800,000
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares)   100,000,000
Common stock, shares outstanding (in shares) 65,016,340 65,436,207