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v3.23.3

Nature of Operations and Significant Accounting Policies - Cumulative effect adjustment to retained earnings and AOCI (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2020
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Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, After-Tax | $ 17,717.0 | $ 16,697.3 |
Increase (Decrease) Accumulated other comprehensive income, After-Tax | $ (6,840.9) | $ (6,879.0) |
Cumulative effect adjustment | Adjustment for reversal of unrealized gain (loss) from AOCI | DAC and other actuarial balances |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | $ 421.5
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | (88.5)
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | 333.0
Cumulative effect adjustment | Adjustment for reversal of unrealized gain (loss) from AOCI | Reinsurance recoverables |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (45.5)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 9.5
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | (36.0)
Cumulative effect adjustment | Adjustment for reversal of unrealized gain (loss) from AOCI | Liability for future policy benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | 1,965.3
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | (452.2)
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | 1,513.1
Cumulative effect adjustment | Adjustment under the modified retrospective approach | Reinsurance recoverables |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | 31.4
Increase (Decrease) Retained earnings, Tax |  |  | (6.6)
Increase (Decrease) Retained earnings, After-Tax |  |  | 24.8
Cumulative effect adjustment | Adjustment under the modified retrospective approach | Liability for future policy benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | (119.1)
Increase (Decrease) Retained earnings, Tax |  |  | 29.8
Increase (Decrease) Retained earnings, After-Tax |  |  | (89.3)
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | 17.9
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | (4.8)
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | 13.1
Cumulative effect adjustment | Effect of remeasurement at the current discount rate | Reinsurance recoverables |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | 201.8
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | (42.4)
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | 159.4
Cumulative effect adjustment | Effect of remeasurement at the current discount rate | Liability for future policy benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (9,043.1)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 2,024.8
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | (7,018.3)
Cumulative effect adjustment | Investment in equity method subsidiary impacted by LDTI | Other investments |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | 22.8
Increase (Decrease) Retained earnings, Tax |  |  | (9.1)
Increase (Decrease) Retained earnings, After-Tax |  |  | 13.7
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (25.5)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 10.2
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | (15.3)
Cumulative effect adjustment | Cumulative effect of amortization basis change | Cost of reinsurance asset (liability) |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | (9.0)
Increase (Decrease) Retained earnings, Tax |  |  | 1.9
Increase (Decrease) Retained earnings, After-Tax |  |  | (7.1)
Cumulative effect adjustment | Adjustment of unrealized loss in AOCI | Cost of reinsurance asset (liability) |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | 16.1
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | (3.4)
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | 12.7
Cumulative effect adjustment | Cumulative effect of changes in the nonperformance risk between the original contract issue date and the transition date | Market risk benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (4.8)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 1.0
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | (3.8)
Cumulative effect adjustment | Adjustments to the host contract for differences between previous carrying amount and measurement of the MRB | Market risk benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | 20.9
Increase (Decrease) Retained earnings, Tax |  |  | (4.4)
Increase (Decrease) Retained earnings, After-Tax |  |  | 16.5
Cumulative effect adjustment | Retained earnings adjustment for the valuation of contracts as MRBs (exclusive of nonperformance risk changes) | Market risk benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | (258.8)
Increase (Decrease) Retained earnings, Tax |  |  | 54.4
Increase (Decrease) Retained earnings, After-Tax |  |  | (204.4)
Cumulative effect adjustment | Reclassification of nonperformance risk changes between retained earnings and AOCI | Market risk benefits |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | 108.4
Increase (Decrease) Retained earnings, Tax |  |  | (22.5)
Increase (Decrease) Retained earnings, After-Tax |  |  | 85.9
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (108.4)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 22.5
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | (85.9)
ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Cumulative effect adjustment |  |  |
Recent Accounting Pronouncements |  |  |
Increase (Decrease) Retained earnings, Pre-Tax |  |  | (203.4)
Increase (Decrease) Retained earnings, Tax |  |  | 43.5
Increase (Decrease) Retained earnings, After-Tax |  |  | (159.9)
Increase (Decrease) Accumulated other comprehensive income, Pre-Tax |  |  | (6,604.7)
Increase (Decrease) Accumulated other comprehensive income, Tax |  |  | 1,476.7
Increase (Decrease) Accumulated other comprehensive income, After-Tax |  |  | $ (5,128.0)

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