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Schedule II Condensed Financial Information of Registrant - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
ASSETS |  |  |  |  |
Investments in subsidiaries | $ 1,138.8 | $ 983.7 | [1] |  |
Total assets | 14,049.9 | 13,306.1 | [1] | $ 14,460.2 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |  |
Short-term debt | 0.0 | 249.0 | [1] |  |
Long-term debt | 546.0 | 249.0 | [1] |  |
Other liabilities | 287.1 | 299.5 | [1] |  |
Total liabilities | 12,874.6 | 12,207.8 | [1] |  |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0.0 | 0.0 | [1] |  |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2023, 66,747,821; 2022, 66,618,465 | 0.1 | 0.1 | [1] |  |
Additional paid-in capital | 510.9 | 502.6 | [1] |  |
Retained earnings | 1,502.2 | 1,512.4 | [1] |  |
Accumulated other comprehensive income (loss), net of taxes: |  |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities | (328.3) | (449.6) | [1] |  |
Net reserve remeasurements attributable to discount rates | 21.9 | 59.0 | [1] |  |
Net funded status of benefit plans | (7.6) | (8.8) | [1] |  |
Treasury stock, at cost, 2023, 25,911,087 shares; 2022, 25,714,153 shares | (523.9) | (517.4) | [1] |  |
Total shareholders' equity | 1,175.3 | 1,098.3 | [2] | $ 1,499.0 | [2]
Total liabilities and shareholders' equity | $ 14,049.9 | $ 13,306.1 | [1] |  |
Common Stock, Shares, Issued | 66,747,821 | 66,618,465 |  |  |
Parent company |  |  |  |  |
ASSETS |  |  |  |  |
Investments and cash | $ 3.4 | $ 2.1 |  |  |
Investments in subsidiaries | 1,716.6 | 1,597.1 |  |  |
Other Assets | 17.1 | 7.1 |  |  |
Total assets | 1,737.1 | 1,606.3 |  |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |  |
Short-term debt | 0.0 | 249.0 |  |  |
Long-term debt | 546.0 | 249.0 |  |  |
Other liabilities | 15.8 | 10.0 |  |  |
Total liabilities | 561.8 | 508.0 |  |  |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0.0 | 0.0 |  |  |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2023, 66,747,821; 2022, 66,618,465 | 0.1 | 0.1 |  |  |
Additional paid-in capital | 510.9 | 502.6 |  |  |
Retained earnings | 1,502.2 | 1,512.4 |  |  |
Accumulated other comprehensive income (loss), net of taxes: |  |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities | (328.3) | (449.6) |  |  |
Net reserve remeasurements attributable to discount rates | 21.9 | 59.0 |  |  |
Net funded status of benefit plans | (7.6) | (8.8) |  |  |
Treasury stock, at cost, 2023, 25,911,087 shares; 2022, 25,714,153 shares | (523.9) | (517.4) |  |  |
Total shareholders' equity | 1,175.3 | 1,098.3 |  |  |
Total liabilities and shareholders' equity | $ 1,737.1 | $ 1,606.3 |  |  |
Common Stock, Shares, Issued | 66,747,821 | 66,618,465 |  |  |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements
[2] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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