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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  |  | $ 11,086.4 |
Balances | $ 11,665.5 |  | 11,665.5 |
Change in redeemable noncontrolling interest rollforward |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period | 391.2 | $ 277.4 | 337.7 | $ 248.9
Net income (loss) attributable to redeemable noncontrolling interest | 18.4 | 14.3 | 55.8 | 15.1
Redeemable noncontrolling interest of deconsolidated entities |  |  | (22.9) | (185.5)
Contributions from redeemable noncontrolling interest | 18.4 | 34.2 | 107.3 | 275.3
Distributions to redeemable noncontrolling interest | (11.0) | (14.8) | (56.1) | (42.8)
Purchase of subsidiary shares from redeemable noncontrolling interest | (2.9) |  | (4.5) | (0.6)
Change in redemption value of redeemable noncontrolling interest |  | (0.7) |  | 0.4
Stock-based compensation attributable to redeemable noncontrolling interest |  |  | 0.1 | 0.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest | (4.0) | 1.4 | (7.3) | 0.9
Redeemable noncontrolling interest, balance at end of period | 410.1 | 311.8 | 410.1 | 311.8
Accumulated other comprehensive income (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (4,713.3) | (5,411.8) | (5,224.8) | (5,345.3)
Other comprehensive income (loss) during the period, net of adjustments | 389.4 | 815.4 | 811.0 | 673.8
Amounts reclassified from AOCI | 17.3 | 11.4 | 107.2 | 86.5
Other comprehensive income (loss) | 406.7 | 826.8 | 918.2 | 760.3
Balances | (4,306.6) | (4,585.0) | (4,306.6) | (4,585.0)
Net unrealized gains (losses) on available-for-sale securities |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (3,854.6) | (4,894.2) | (4,692.9) | (4,014.8)
Other comprehensive income (loss) during the period, net of adjustments | 674.9 | 2,106.5 | 1,428.8 | 1,158.1
Amounts reclassified from AOCI | 16.7 | 8.4 | 101.1 | 77.4
Other comprehensive income (loss) | 691.6 | 2,114.9 | 1,529.9 | 1,235.5
Balances | (3,163.0) | (2,779.3) | (3,163.0) | (2,779.3)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses | (4.7) | (2.6) | (4.7) | (2.6)
Net unrealized gains (losses) on derivative instruments |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (98.8) | 39.4 | 51.8 | (2.1)
Other comprehensive income (loss) during the period, net of adjustments | 71.8 | (37.3) | (77.9) | 5.6
Amounts reclassified from AOCI | (2.5) | (0.7) | (3.4) | (2.1)
Other comprehensive income (loss) | 69.3 | (38.0) | (81.3) | 3.5
Balances | (29.5) | 1.4 | (29.5) | 1.4
Liability for future policy benefits discount rate remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 1,105.9 | 1,376.4 | 1,438.2 | 428.2
Other comprehensive income (loss) during the period, net of adjustments | (363.3) | (1,317.4) | (695.6) | (369.2)
Other comprehensive income (loss) | (363.3) | (1,317.4) | (695.6) | (369.2)
Balances | 742.6 | 59.0 | 742.6 | 59.0
Market risk benefit nonperformance risk remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (13.3) | (14.5) | (15.0) | (6.9)
Other comprehensive income (loss) during the period, net of adjustments | (4.6) | (5.3) | (2.9) | (12.9)
Other comprehensive income (loss) | (4.6) | (5.3) | (2.9) | (12.9)
Balances | (17.9) | (19.8) | (17.9) | (19.8)
Foreign currency translation adjustment |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (1,627.8) | (1,672.5) | (1,785.9) | (1,498.0)
Other comprehensive income (loss) during the period, net of adjustments | 10.6 | 68.9 | 168.7 | (105.6)
Other comprehensive income (loss) | 10.6 | 68.9 | 168.7 | (105.6)
Balances | (1,617.2) | (1,603.6) | (1,617.2) | (1,603.6)
Unrecognized postretirement benefit obligations |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (224.7) | (246.4) | (221.0) | (251.7)
Other comprehensive income (loss) during the period, net of adjustments |  |  | (10.1) | (2.2)
Amounts reclassified from AOCI | 3.1 | 3.7 | 9.5 | 11.2
Other comprehensive income (loss) | 3.1 | 3.7 | (0.6) | 9.0
Balances | $ (221.6) | $ (242.7) | $ (221.6) | $ (242.7)

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