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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 1996
--- | --- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 5,756.9 | $ 5,797.7 |  |
Preferred stock, par value (in usd per share) | $ 0.001 | $ 0.001 |  | $ 0.001
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000 |  | 1,000,000
Preferred stock, shares issued (in shares) | 0 | 0 |  |
Common stock, par value (in usd per share) | $ 0.001 | $ 0.001 | $ 0.001 |
Common stock, shares authorized (in shares) | 75,000,000 | 75,000,000 |  |
Common stock, shares issued (in shares) | 66,618,465 | 66,436,821 |  |
Treasury stock (in shares) | 25,714,153 | 25,043,337 |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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