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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  |  | $ 9,976.7 |
Adjustment for reinsurance |  | $ 114.6 |  | $ 114.6
Balances | $ 10,344.5 |  | 10,344.5 |
Change in redeemable noncontrolling interest rollforward |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period | 272.7 | 306.8 | 262.0 | 332.5
Net income (loss) attributable to redeemable noncontrolling interest | 3.6 | (23.1) | 8.1 | (33.4)
Redeemable noncontrolling interest of deconsolidated entities | (0.6) |  | (3.0) |
Contributions from redeemable noncontrolling interest | 4.3 | 7.0 | 23.3 | 31.0
Distributions to redeemable noncontrolling interest | (14.4) | (21.8) | (22.8) | (61.4)
Purchase of subsidiary shares from redeemable noncontrolling interest |  |  | (1.6) |
Change in redemption value of redeemable noncontrolling interest | 0.7 | 0.3 | 0.1 | 0.4
Other comprehensive income (loss) attributable to redeemable noncontrolling interest | 0.4 | (0.7) | 0.6 | (0.6)
Redeemable noncontrolling interest, balance at end of period | 266.7 | 268.5 | 266.7 | 268.5
Accumulated other comprehensive income (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (6,201.3) | (3,461.9) | (6,879.0) | (2,084.1)
Other comprehensive income (loss) during the period, net of adjustments | (130.8) | (2,794.7) | 483.9 | (4,138.4)
Amounts reclassified to accumulated other comprehensive income (loss) | 86.9 | 35.8 | 149.9 | 1.7
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (43.9) | (2,758.9) | 633.8 | (4,136.7)
Adjustment for reinsurance |  | 114.6 |  | 114.6
Balances | (6,245.2) | (6,106.2) | (6,245.2) | (6,106.2)
Net unrealized gains (losses) on available-for-sale securities |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (4,779.8) | (231.8) | (5,857.9) | 3,880.4
Other comprehensive income (loss) during the period, net of adjustments | (625.5) | (3,898.3) | 390.5 | (7,975.1)
Amounts reclassified to accumulated other comprehensive income (loss) | 83.1 | 37.5 | 145.2 | 2.1
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (542.4) | (3,860.8) | 535.7 | (7,973.0)
Adjustment for reinsurance |  | 108.4 |  | 108.4
Balances | (5,322.2) | (3,984.2) | (5,322.2) | (3,984.2)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses | (1.9) | (2.1) | (1.9) | (2.1)
Net unrealized gains (losses) on derivative instruments |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 39.7 | 37.8 | 39.7 | 56.6
Other comprehensive income (loss) during the period, net of adjustments | (4.8) | (2.5) | (1.9) | (15.9)
Amounts reclassified to accumulated other comprehensive income (loss) | (1.0) | (8.4) | (3.9) | (13.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (5.8) | (10.9) | (5.8) | (29.7)
Adjustment for reinsurance |  | 6.2 |  | 6.2
Balances | 33.9 | 33.1 | 33.9 | 33.1
Liability for future policy benefits discount rate remeasurement gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 200.0 | (1,518.5) | 740.9 | (4,037.6)
Other comprehensive income (loss) during the period, net of adjustments | 509.2 | 1,309.3 | (31.7) | 3,828.4
Amounts reclassified to accumulated other comprehensive income (loss) |  |  | 0.0 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 509.2 | 1,309.3 | (31.7) | 3,828.4
Balances | 709.2 | (209.2) | 709.2 | (209.2)
Market risk benefit nonperformance risk gain (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 30.0 | (16.4) | 24.0 | (90.1)
Other comprehensive income (loss) during the period, net of adjustments | (5.6) | 60.2 | 0.4 | 133.9
Amounts reclassified to accumulated other comprehensive income (loss) |  |  | 0.0 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (5.6) | 60.2 | 0.4 | 133.9
Balances | 24.4 | 43.8 | 24.4 | 43.8
Foreign currency translation adjustment |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (1,440.9) | (1,395.0) | (1,571.6) | (1,548.7)
Other comprehensive income (loss) during the period, net of adjustments | 9.5 | (265.0) | 140.2 | (111.3)
Amounts reclassified to accumulated other comprehensive income (loss) | 0.3 |  | 0.3 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 9.8 | (265.0) | 140.5 | (111.3)
Balances | (1,431.1) | (1,660.0) | (1,431.1) | (1,660.0)
Unrecognized postretirement benefit obligations |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (250.3) | (338.0) | (254.1) | (344.7)
Other comprehensive income (loss) during the period, net of adjustments | (13.6) | 1.6 | (13.6) | 1.6
Amounts reclassified to accumulated other comprehensive income (loss) | 4.5 | 6.7 | 8.3 | 13.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (9.1) | 8.3 | (5.3) | 15.0
Balances | $ (259.4) | $ (329.7) | $ (259.4) | $ (329.7)

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