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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  |  | $ 11,086.4 |
Balances | $ 11,415.3 |  | 11,415.3 |
Change in redeemable noncontrolling interest rollforward |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period | 326.7 | $ 370.8 | 337.7 | $ 248.9
Net income (loss) attributable to redeemable noncontrolling interest | 25.9 | 2.8 | 37.4 | 0.8
Redeemable noncontrolling interest of deconsolidated entities | (10.4) | (95.5) | (22.9) | (185.5)
Contributions from redeemable noncontrolling interest | 58.1 | 14.9 | 88.9 | 241.1
Distributions to redeemable noncontrolling interest | (13.3) | (13.8) | (45.1) | (28.0)
Purchase of subsidiary shares from redeemable noncontrolling interest |  | (0.6) | (1.6) | (0.6)
Change in redemption value of redeemable noncontrolling interest |  | (1.0) |  | 1.1
Stock-based compensation attributable to redeemable noncontrolling interest | 0.1 | 0.1 | 0.1 | 0.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest | 4.1 | (0.3) | (3.3) | (0.5)
Redeemable noncontrolling interest, balance at end of period | 391.2 | 277.4 | 391.2 | 277.4
Accumulated other comprehensive income (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (4,785.9) | (5,256.1) | (5,224.8) | (5,345.3)
Other comprehensive income (loss) during the period, net of adjustments | 34.5 | (193.5) | 421.6 | (141.6)
Amounts reclassified from AOCI | 38.1 | 37.8 | 89.9 | 75.1
Other comprehensive income (loss) | 72.6 | (155.7) | 511.5 | (66.5)
Balances | (4,713.3) | (5,411.8) | (4,713.3) | (5,411.8)
Net unrealized gains (losses) on available-for-sale securities |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (4,103.5) | (4,373.4) | (4,692.9) | (4,014.8)
Other comprehensive income (loss) during the period, net of adjustments | 213.9 | (555.3) | 753.9 | (948.4)
Amounts reclassified from AOCI | 35.0 | 34.5 | 84.4 | 69.0
Other comprehensive income (loss) | 248.9 | (520.8) | 838.3 | (879.4)
Balances | (3,854.6) | (4,894.2) | (3,854.6) | (4,894.2)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses | (4.5) | (2.4) | (4.5) | (2.4)
Net unrealized gains (losses) on derivative instruments |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 65.9 | 15.4 | 51.8 | (2.1)
Other comprehensive income (loss) during the period, net of adjustments | (164.3) | 24.7 | (149.7) | 42.9
Amounts reclassified from AOCI | (0.4) | (0.7) | (0.9) | (1.4)
Other comprehensive income (loss) | (164.7) | 24.0 | (150.6) | 41.5
Balances | (98.8) | 39.4 | (98.8) | 39.4
Liability for future policy benefits discount rate remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 1,188.4 | 982.9 | 1,438.2 | 428.2
Other comprehensive income (loss) during the period, net of adjustments | (82.5) | 393.5 | (332.3) | 948.2
Other comprehensive income (loss) | (82.5) | 393.5 | (332.3) | 948.2
Balances | 1,105.9 | 1,376.4 | 1,105.9 | 1,376.4
Market risk benefit nonperformance risk remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (12.9) | (15.6) | (15.0) | (6.9)
Other comprehensive income (loss) during the period, net of adjustments | (0.4) | 1.1 | 1.7 | (7.6)
Other comprehensive income (loss) | (0.4) | 1.1 | 1.7 | (7.6)
Balances | (13.3) | (14.5) | (13.3) | (14.5)
Foreign currency translation adjustment |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (1,705.7) | (1,617.2) | (1,785.9) | (1,498.0)
Other comprehensive income (loss) during the period, net of adjustments | 77.9 | (55.3) | 158.1 | (174.5)
Other comprehensive income (loss) | 77.9 | (55.3) | 158.1 | (174.5)
Balances | (1,627.8) | (1,672.5) | (1,627.8) | (1,672.5)
Unrecognized postretirement benefit obligations |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (218.1) | (248.2) | (221.0) | (251.7)
Other comprehensive income (loss) during the period, net of adjustments | (10.1) | (2.2) | (10.1) | (2.2)
Amounts reclassified from AOCI | 3.5 | 4.0 | 6.4 | 7.5
Other comprehensive income (loss) | (6.6) | 1.8 | (3.7) | 5.3
Balances | $ (224.7) | $ (246.4) | $ (224.7) | $ (246.4)

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