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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Common stock | Additional paid-in capital | Retained earnings Effects of implementation of accounting change | Retained earnings | Accumulated other comprehensive income (loss) Effects of implementation of accounting change | Accumulated other comprehensive income (loss) | Treasury Stock | Noncontrolling interest | Effects of implementation of accounting change | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances (ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts) at Dec. 31, 2020 |  |  |  | $ (159.9) |  | $ (5,128.0) |  |  |  | $ (5,287.9) |
Balances at Dec. 31, 2020 |  | $ 4.8 | $ 10,321.6 |  | $ 11,838.0 |  | $ 2,383.1 | $ (7,988.6) | $ 58.4 |  | $ 16,617.3
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 86.7 |  |  |  |  |  |  |  | 86.7
Stock-based compensation |  |  | 106.1 |  | (10.0) |  |  |  | 0.1 |  | 96.2
Treasury stock acquired, common |  |  |  |  |  |  |  | (937.2) |  |  | (937.2)
Dividends to common stockholders |  |  |  |  | (654.1) |  |  |  |  |  | (654.1)
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  | (33.7) |  | (33.7)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  | 7.4 |  | 7.4
Purchase of subsidiary shares from noncontrolling interest | [1] |  | (16.4) |  |  |  |  |  | (1.7) |  | (18.1)
Adjustments to redemption amount of redeemable noncontrolling interest |  |  | (3.0) |  |  |  |  |  | (0.1) |  | (3.1)
Net income (loss) | [1] |  |  |  | 1,580.2 |  |  |  | 29.3 |  | 1,609.5
Other comprehensive income (loss) | [1] |  |  |  |  |  | 660.8 |  | (3.3) |  | 657.5
Balances at Dec. 31, 2021 |  | 4.8 | 10,495.0 |  | 12,594.2 |  | (2,084.1) | (8,925.8) | 56.4 |  | 12,140.5
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 0.1 | 181.6 |  |  |  |  |  |  |  | 181.7
Stock-based compensation |  |  | 102.7 |  | (11.5) |  |  |  | 0.4 |  | 91.6
Treasury stock acquired, common |  |  |  |  |  |  |  | (1,661.1) |  |  | (1,661.1)
Accelerated share repurchase |  |  | (33.9) |  |  |  |  |  |  |  | (33.9)
Dividends to common stockholders |  |  |  |  | (642.3) |  |  |  |  |  | (642.3)
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  | (86.2) |  | (86.2)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  | 7.3 |  | 7.3
Purchase of subsidiary shares from noncontrolling interest | [1] |  | (5.7) |  |  |  |  |  | (2.4) |  | (8.1)
Adjustments to redemption amount of redeemable noncontrolling interest |  |  | 0.7 |  |  |  |  |  | (0.5) |  | 0.2
Adjustment for reinsurance |  |  |  |  |  |  | 114.5 |  |  |  | 114.5
Net income (loss) | [1] |  |  |  | 4,756.9 |  |  |  | 66.4 |  | 4,823.3
Other comprehensive income (loss) | [1] |  |  |  |  |  | (4,909.4) |  | (0.3) |  | (4,909.7)
Balances at Dec. 31, 2022 |  | 4.9 | 10,740.4 |  | 16,697.3 |  | (6,879.0) | (10,586.9) | 41.1 |  | 10,017.8
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 57.8 |  |  |  |  |  |  |  | 57.8
Stock-based compensation |  |  | 110.7 |  | (11.5) |  |  |  | 0.5 |  | 99.7
Treasury stock acquired, common |  |  |  |  |  |  |  | (748.8) |  |  | (748.8)
Dividends to common stockholders |  |  |  |  | (625.5) |  |  |  |  |  | (625.5)
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  | (26.5) |  | (26.5)
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  | 7.6 |  | 7.6
Purchase of subsidiary shares from noncontrolling interest | [1] |  | (1.2) |  |  |  |  |  |  |  | (1.2)
Adjustments to redemption amount of redeemable noncontrolling interest |  |  | 0.9 |  |  |  |  |  | 0.2 |  | 1.1
Net income (loss) | [1] |  |  |  | 623.2 |  |  |  | 23.2 |  | 646.4
Other comprehensive income (loss) | [1] |  |  |  |  |  | 1,533.7 |  | (0.4) |  | 1,533.3
Balances at Dec. 31, 2023 |  | $ 4.9 | $ 10,908.6 |  | $ 16,683.5 |  | $ (5,345.3) | $ (11,335.7) | $ 45.7 |  | $ 10,961.7
[1] | Excludes amounts attributable to redeemable noncontrolling interest. See Note 17, Stockholders’ Equity, for further details.

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