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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Revision of Prior Period, Accounting Standards Update, Adjustment | Previously Reported [Member] | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Other Comprehensive Loss Previously Reported [Member] | Retained Earnings | Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings Previously Reported [Member] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock, Common
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Beginning of Year at Dec. 31, 2021 |  |  |  |  | $ 30.7 | $ 2,408.1 | $ (5,164.6) |  | $ 354.1 |  |  | $ 11,853.2 |  | $ (3,229.7)
Balance at Beginning of Year (Accounting Standards Update 2018-12) at Dec. 31, 2021 |  |  |  |  |  |  |  | $ (5,518.7) |  |  | $ 136.2 |  | $ 11,989.4 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Activity |  |  |  |  | 0.1 | (0.2) |  |  |  |  |  |  |  |
Other Comprehensive Income | $ 726.1 |  |  | $ (934.2) |  |  | 726.1 |  |  |  |  |  |  |
Other Comprehensive Income | Accounting Standards Update 2018-12 |  |  | $ 1,660.3 |  |  |  |  |  |  |  |  |  |  |
Net Income | 240.4 |  |  | 253.5 |  |  |  |  |  | $ 240.4 |  |  |  |
Net Income | Accounting Standards Update 2018-12 |  |  | (13.1) |  |  |  |  |  |  |  |  |  |  |
Dividends to Stockholders (per common share: $0.330; $0.300) |  |  |  |  |  |  |  |  |  | (62.9) |  |  |  |
Balance at End of Year at Mar. 31, 2022 | 6,887.8 |  |  | 10,623.1 | 30.8 | 2,395.8 | (4,438.5) |  |  | 12,166.9 |  |  |  | (3,267.2)
Balance at End of Year (Accounting Standards Update 2018-12) at Mar. 31, 2022 |  |  | (3,735.3) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Shares Repurchased | (37.5) | [1] |  |  |  | 12.5 |  |  |  |  |  |  |  | (37.5)
Balance at Beginning of Year at Dec. 31, 2021 |  |  |  |  | 30.7 | 2,408.1 | (5,164.6) |  | 354.1 |  |  | 11,853.2 |  | (3,229.7)
Balance at Beginning of Year (Accounting Standards Update 2018-12) at Dec. 31, 2021 |  |  |  |  |  |  |  | (5,518.7) |  |  | 136.2 |  | 11,989.4 |
Balance at End of Year at Dec. 31, 2022 | 8,735.0 |  |  | $ 9,197.5 | 30.8 | 2,441.0 | (3,448.3) |  | $ (3,448.3) |  |  | $ 13,141.3 |  | (3,429.8)
Balance at End of Year (Accounting Standards Update 2018-12) at Dec. 31, 2022 |  |  | $ (462.5) |  |  |  |  | $ 0.0 |  |  | $ 0.0 |  | $ 13,141.3 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Activity |  |  |  |  | 0.1 | 9.2 |  |  |  |  |  |  |  |
Other Comprehensive Income | 286.0 |  |  |  |  |  | 286.0 |  |  |  |  |  |  |
Net Income | 358.3 |  |  |  |  |  |  |  |  | 358.3 |  |  |  |
Dividends to Stockholders (per common share: $0.330; $0.300) |  |  |  |  |  |  |  |  |  | (69.2) |  |  |  |
Balance at End of Year at Mar. 31, 2023 | 9,247.4 |  |  |  | $ 30.9 | 2,431.8 | $ (3,162.3) |  |  | $ 13,430.4 |  |  |  | (3,483.4)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Shares Repurchased | $ (53.6) | [1] |  |  |  | $ 0.0 |  |  |  |  |  |  |  | $ (53.6)
[1] | 1Includes a de minimis amount of commissions and $0.1 million of excise tax for the three months ended March 31, 2023. There were no commissions or excise taxes during the three months ended March 31, 2022.

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