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Schedule II Condensed Financial Information of Registrant - Condensed Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
ASSETS |  |  |
Investments in subsidiaries | $ 712.8 | $ 449.0 |
Other assets | 441.3 | 443.2 |
Total assets | 14,383.9 | 13,471.8 | $ 12,478.7
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Short-term debt | 249.0 | 135.0 |
Long-term debt | 253.6 | 302.3 |
Other liabilities | 428.2 | 453.1 |
Total liabilities | 12,576.5 | 11,681.7 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0.0 | 0.0 |
Common stock, $1,000 par value, authorized 75,000,000 shares; issued, 2021, 66,436,821; 2020, 66,316,797 | 0.1 | 0.1 |
Additional paid-in capital | 495.3 | 488.4 |
Retained earnings | 1,524.9 | 1,434.6 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity securities | 290.7 | 366.3 |
Net funded status of benefit plans | (10.2) | (11.2) |
Treasury stock, at cost, 2021, 25,043,337 shares; 2020, 24,902,579 shares | (493.4) | (488.1) |
Total shareholders' equity | 1,807.4 | 1,790.1 | $ 1,567.3
Total liabilities and shareholders' equity | 14,383.9 | 13,471.8 |
Parent company |  |  |
ASSETS |  |  |
Investments and cash | 115.3 | 4.1 |
Investments in subsidiaries | 2,191.3 | 2,121.0 |
Other assets | 11.3 | 58.9 |
Total assets | 2,317.9 | 2,184.0 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Short-term debt | 249.0 | 135.0 |
Long-term debt | 248.6 | 248.3 |
Other liabilities | 12.9 | 10.6 |
Total liabilities | 510.5 | 393.9 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0.0 | 0.0 |
Common stock, $1,000 par value, authorized 75,000,000 shares; issued, 2021, 66,436,821; 2020, 66,316,797 | 0.1 | 0.1 |
Additional paid-in capital | 495.3 | 488.4 |
Retained earnings | 1,524.9 | 1,434.6 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity securities | 290.7 | 366.3 |
Net funded status of benefit plans | (10.2) | (11.2) |
Treasury stock, at cost, 2021, 25,043,337 shares; 2020, 24,902,579 shares | (493.4) | (488.1) |
Total shareholders' equity | 1,807.4 | 1,790.1 |
Total liabilities and shareholders' equity | $ 2,317.9 | $ 2,184.0 |

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