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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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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

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