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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Fixed maturities, at amortized cost | $ 6,735,300,000 | $ 6,372,700,000
Fixed maturities, allowance for credit losses | 5,400,000 | 0
Premium receivables, allowance for credit losses | 29,900,000 | 22,300,000
Equity securities, at cost | 704,400,000 | 818,800,000
Debt, at fair value | $ 824,100,000 | $ 820,200,000
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000
Common stock, shares issued (in shares) | 65,282,157 | 66,665,888
Common stock, shares outstanding (in shares) | 65,282,157 | 66,665,888

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