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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss), pre-tax | $ (715.7) | $ (1,598.9) | $ 70.0 | $ (6,824.4)
Other comprehensive income (loss), tax | 117.9 | 324.6 | (32.5) | 1,411.2
Other comprehensive income (loss) | (597.8) | (1,274.3) | 37.5 | (5,413.2)
Net unrealized gains (losses) on available-for-sale securities including NCI |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax | (2,333.5) | (3,653.1) | (1,840.4) | (14,038.6)
Adjustments for assumed changes in amortization patterns, pre-tax | (1.8) | (1.1) | (2.5) | (3.8)
Adjustments for assumed changes in policyholder liabilities, pre-tax | 0.6 | 0.3 | 0.7 | 273.1
Other comprehensive income (loss), pre-tax | (2,304.4) | (3,577.6) | (1,628.2) | (13,685.5)
Other comprehensive income (loss) before reclassifications, tax | 501.0 | 778.2 | 398.8 | 2,975.2
Reclassification from accumulated other comprehensive income, tax | (6.2) | (15.6) | (44.7) | (21.0)
Adjustments for assumed changes in amortization patterns, tax | 0.4 | 0.2 | 0.6 | 0.8
Adjustments for assumed changes in policyholder liabilities, tax | (0.2) | (0.1) | (0.2) | (57.5)
Other comprehensive income (loss), tax | 495.0 | 762.7 | 354.5 | 2,897.5
Other comprehensive income (loss) before reclassifications, after-tax | (1,832.5) | (2,874.9) | (1,441.6) | (11,063.4)
Reclassification from accumulated other comprehensive income, after-tax | 24.1 | 60.7 | 169.3 | 62.8
Adjustments for assumed changes in amortization patterns, after-tax | (1.4) | (0.9) | (1.9) | (3.0)
Adjustments for assumed changes in policyholder liabilities, after-tax | 0.4 | 0.2 | 0.5 | 215.6
Other comprehensive income (loss) | (1,809.4) | (2,814.9) | (1,273.7) | (10,788.0)
Net unrealized gains (losses) on available-for-sale securities including NCI | Net realized capital gains (losses) |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Reclassification from accumulated other comprehensive income, pre-tax | 30.3 | 76.3 | 214.0 | 83.8
Net unrealized gains (losses) on derivative instruments including NCI |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax | (16.8) | 104.6 | (19.3) | 84.2
Reclassification from accumulated other comprehensive income, pre-tax | (1.3) | (4.4) | (6.2) | (21.8)
Adjustments for assumed changes in amortization patterns, pre-tax | (0.9) |  | (0.9) | (0.1)
Adjustments for assumed changes in policyholder liabilities, pre-tax | 0.2 |  | 0.2 | 0.4
Other comprehensive income (loss), pre-tax | (18.8) | 100.2 | (26.2) | 62.7
Other comprehensive income (loss) before reclassifications, tax | 3.5 | (22.0) | 4.1 | (17.7)
Reclassification from accumulated other comprehensive income, tax | 0.3 | 1.0 | 1.3 | 4.6
Adjustments for assumed changes in amortization patterns, tax | 0.2 |  | 0.2 |
Adjustments for assumed changes in policyholder liabilities, tax | (0.1) |  | (0.1) | (0.1)
Other comprehensive income (loss), tax | 3.9 | (21.0) | 5.5 | (13.2)
Other comprehensive income (loss) before reclassifications, after-tax | (13.3) | 82.6 | (15.2) | 66.5
Reclassification from accumulated other comprehensive income, after-tax | (1.0) | (3.4) | (4.9) | (17.2)
Adjustments for assumed changes in amortization patterns, after-tax | (0.7) |  | (0.7) | (0.1)
Adjustments for assumed changes in policyholder liabilities, after-tax | 0.1 |  | 0.1 | 0.3
Other comprehensive income (loss) | (14.9) | 79.2 | (20.7) | 49.5
Liability for future policy benefits discount rate remeasurement gain (loss) |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss), pre-tax | 1,773.5 | 1,936.7 | 1,746.1 | 6,775.1
Other comprehensive income (loss), tax | (399.9) | (425.1) | (404.2) | (1,435.1)
Other comprehensive income (loss) | 1,373.6 | 1,511.6 | 1,341.9 | 5,340.0
Market risk benefit nonperformance risk gain (loss) |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss), pre-tax | (22.6) | (3.7) | (22.2) | 165.7
Other comprehensive income (loss), tax | 4.7 | 0.8 | 4.7 | (34.7)
Other comprehensive income (loss) | (17.9) | (2.9) | (17.5) | 131.0
Foreign currency translation adjustment including NCI |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax | (149.1) |  | 1.6 |
Reclassification from accumulated other comprehensive income, pre-tax | 0.1 |  | 0.4 |
Other comprehensive income (loss), pre-tax | (149.0) | (63.8) | 2.0 | (172.2)
Other comprehensive income (loss) before reclassifications, tax | 15.6 |  | 6.6 |
Other comprehensive income (loss), tax | 15.6 | 9.5 | 6.6 | 4.5
Other comprehensive income (loss) before reclassifications, after-tax | (133.5) |  | 8.2 |
Reclassification from accumulated other comprehensive income, after-tax | 0.1 |  | 0.4 |
Other comprehensive income (loss) | (133.4) | (54.3) | 8.6 | (167.7)
Unrecognized postretirement benefit obligation including NCI |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Other comprehensive income (loss) before reclassifications, pre-tax |  | 0.1 | (18.3) | 2.2
Other comprehensive income (loss), pre-tax | 5.6 | 9.3 | (1.5) | 29.8
Other comprehensive income (loss) before reclassifications, tax | 0.1 | (0.1) | 4.8 | (0.6)
Reclassification from accumulated other comprehensive income, tax | (1.5) | (2.2) | (4.4) | (7.2)
Other comprehensive income (loss), tax | (1.4) | (2.3) | 0.4 | (7.8)
Other comprehensive income (loss) before reclassifications, after-tax | 0.1 |  | (13.5) | 1.6
Reclassification from accumulated other comprehensive income, after-tax | 4.1 | 7.0 | 12.4 | 20.4
Other comprehensive income (loss) | 4.2 | 7.0 | (1.1) | 22.0
Unrecognized postretirement benefit obligation including NCI | Operating expense |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |
Reclassification from accumulated other comprehensive income, pre-tax | $ 5.6 | $ 9.2 | $ 16.8 | $ 27.6

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