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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  |  | $ 10,916.0 |
Balances | $ 11,013.4 |  | 11,013.4 |
Change in redeemable noncontrolling interest rollforward |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period | 370.8 | $ 272.7 | 248.9 | $ 262.0
Net income (loss) attributable to redeemable noncontrolling interest | 2.8 | 3.6 | 0.8 | 8.1
Redeemable noncontrolling interest of deconsolidated entities | (95.5) | (0.6) | (185.5) | (3.0)
Contributions from redeemable noncontrolling interest | 14.9 | 4.3 | 241.1 | 23.3
Distributions to redeemable noncontrolling interest | (13.8) | (14.4) | (28.0) | (22.8)
Purchase of subsidiary shares from redeemable noncontrolling interest | (0.6) |  | (0.6) | (1.6)
Change in redemption value of redeemable noncontrolling interest | (1.0) | 0.7 | 1.1 | 0.1
Stock-based compensation attributable to redeemable noncontrolling interest | 0.1 |  | 0.1 |
Other comprehensive income (loss) attributable to redeemable noncontrolling interest | (0.3) | 0.4 | (0.5) | 0.6
Redeemable noncontrolling interest, balance at end of period | 277.4 | 266.7 | 277.4 | 266.7
Accumulated other comprehensive income (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (5,256.1) | (6,201.3) | (5,345.3) | (6,879.0)
Other comprehensive income (loss) during the period, net of adjustments | (193.5) | (130.8) | (141.6) | 483.9
Amounts reclassified to accumulated other comprehensive income (loss) | 37.8 | 86.9 | 75.1 | 149.9
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (155.7) | (43.9) | (66.5) | 633.8
Balances | (5,411.8) | (6,245.2) | (5,411.8) | (6,245.2)
Net unrealized gains (losses) on available-for-sale securities |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (4,373.4) | (4,779.8) | (4,014.8) | (5,857.9)
Other comprehensive income (loss) during the period, net of adjustments | (555.3) | (625.5) | (948.4) | 390.5
Amounts reclassified to accumulated other comprehensive income (loss) | 34.5 | 83.1 | 69.0 | 145.2
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (520.8) | (542.4) | (879.4) | 535.7
Balances | (4,894.2) | (5,322.2) | (4,894.2) | (5,322.2)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses | 2.4 | 1.9 | 2.4 | 1.9
Net unrealized gains (losses) on derivative instruments |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 15.4 | 39.7 | (2.1) | 39.7
Other comprehensive income (loss) during the period, net of adjustments | 24.7 | (4.8) | 42.9 | (1.9)
Amounts reclassified to accumulated other comprehensive income (loss) | (0.7) | (1.0) | (1.4) | (3.9)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 24.0 | (5.8) | 41.5 | (5.8)
Balances | 39.4 | 33.9 | 39.4 | 33.9
Liability for future policy benefits discount rate remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 982.9 | 200.0 | 428.2 | 740.9
Other comprehensive income (loss) during the period, net of adjustments | 393.5 | 509.2 | 948.2 | (31.7)
Amounts reclassified to accumulated other comprehensive income (loss) |  |  | 0.0 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 393.5 | 509.2 | 948.2 | (31.7)
Balances | 1,376.4 | 709.2 | 1,376.4 | 709.2
Market risk benefit nonperformance risk remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (15.6) | 30.0 | (6.9) | 24.0
Other comprehensive income (loss) during the period, net of adjustments | 1.1 | (5.6) | (7.6) | 0.4
Amounts reclassified to accumulated other comprehensive income (loss) |  |  | 0.0 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 1.1 | (5.6) | (7.6) | 0.4
Balances | (14.5) | 24.4 | (14.5) | 24.4
Foreign currency translation adjustment |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (1,617.2) | (1,440.9) | (1,498.0) | (1,571.6)
Other comprehensive income (loss) during the period, net of adjustments | (55.3) | 9.5 | (174.5) | 140.2
Amounts reclassified to accumulated other comprehensive income (loss) |  | 0.3 | 0.0 | 0.3
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (55.3) | 9.8 | (174.5) | 140.5
Balances | (1,672.5) | (1,431.1) | (1,672.5) | (1,431.1)
Unrecognized postretirement benefit obligations |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (248.2) | (250.3) | (251.7) | (254.1)
Other comprehensive income (loss) during the period, net of adjustments | (2.2) | (13.6) | (2.2) | (13.6)
Amounts reclassified to accumulated other comprehensive income (loss) | 4.0 | 4.5 | 7.5 | 8.3
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 1.8 | (9.1) | 5.3 | (5.3)
Balances | $ (246.4) | $ (259.4) | $ (246.4) | $ (259.4)

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