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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  |  | $ 16,069.4 |
Purchase of subsidiary shares from noncontrolling interest | [1] | $ (1.4) | $ (1.1) | (8.1) | $ (18.1)
Adjustment for reinsurance |  |  |  | 131.8 |
Balances |  | 9,446.2 |  | 9,446.2 |
Change in redeemable noncontrolling interest rollforward |  |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period |  | 268.5 | 330.6 | 332.5 | 255.6
Net income (loss) attributable to redeemable noncontrolling interest |  | (4.6) | 2.7 | (38.0) | 9.5
Redeemable noncontrolling interest of deconsolidated entities |  | (2.8) | (37.4) | (2.8) | (37.4)
Contributions from redeemable noncontrolling interest |  | 17.2 | 60.2 | 48.2 | 148.2
Distributions to redeemable noncontrolling interest |  | (22.7) | (11.7) | (84.1) | (34.8)
Purchase of subsidiary shares from redeemable noncontrolling interest |  | (1.1) | (0.7) | (1.1) | (6.1)
Change in redemption value of redeemable noncontrolling interest |  | (0.5) |  | (0.1) | 8.6
Other comprehensive income (loss) attributable to redeemable noncontrolling interest |  | 1.1 | (0.4) | 0.5 | (0.3)
Redeemable noncontrolling interest, balance at end of period |  | 255.1 | 343.3 | 255.1 | 343.3
Accumulated other comprehensive income (loss) |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (5,630.1) | 1,803.8 | 1,610.9 | 2,383.1
Other comprehensive income (loss) during the period, net of adjustments |  | (2,504.8) | (188.4) | (9,879.3) | (778.4)
Amounts reclassified to accumulated other comprehensive income (loss) |  | 64.3 | 3.8 | 66.0 | 14.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (2,440.5) | (184.6) | (9,813.3) | (763.9)
Adjustment for reinsurance |  |  |  | 131.8 |
Balances |  | (8,070.6) | 1,619.2 | (8,070.6) | 1,619.2
Net unrealized gains (losses) on available-for-sale securities |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (3,649.7) | 3,555.8 | 3,467.4 | 4,138.3
Other comprehensive income (loss) during the period, net of adjustments |  | (2,531.7) | (21.2) | (9,775.3) | (602.5)
Amounts reclassified to accumulated other comprehensive income (loss) |  | 60.7 | (2.4) | 62.8 | (3.6)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (2,471.0) | (23.6) | (9,712.5) | (606.1)
Adjustment for reinsurance |  |  |  | 124.4 |
Balances |  | (6,120.7) | 3,532.2 | (6,120.7) | 3,532.2
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses |  | 0.9 | (16.2) | 0.9 | (16.2)
Net unrealized gains (losses) on derivative instruments |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 31.5 | 29.9 | 51.8 | 18.2
Other comprehensive income (loss) during the period, net of adjustments |  | 81.8 | 23.8 | 67.9 | 42.7
Amounts reclassified to accumulated other comprehensive income (loss) |  | (3.4) | (3.1) | (17.2) | (10.3)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 78.4 | 20.7 | 50.7 | 32.4
Adjustment for reinsurance |  |  |  | 7.4 |
Balances |  | 109.9 | 50.6 | 109.9 | 50.6
Foreign currency translation adjustment |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (1,682.2) | (1,333.3) | (1,563.6) | (1,312.9)
Other comprehensive income (loss) during the period, net of adjustments |  | (54.9) | (191.0) | (173.5) | (211.4)
Amounts reclassified to accumulated other comprehensive income (loss) |  | 0.0 |  | 0.0 |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (54.9) | (191.0) | (173.5) | (211.4)
Balances |  | (1,737.1) | (1,524.3) | (1,737.1) | (1,524.3)
Unrecognized postretirement benefit obligations |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (329.7) | (448.6) | (344.7) | (460.5)
Other comprehensive income (loss) during the period, net of adjustments |  |  |  | 1.6 | (7.2)
Amounts reclassified to accumulated other comprehensive income (loss) |  | 7.0 | 9.3 | 20.4 | 28.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 7.0 | 9.3 | 22.0 | 21.2
Balances |  | $ (322.7) | $ (439.3) | $ (322.7) | $ (439.3)
[1] | Excludes amounts attributable to redeemable noncontrolling interest. See Note 11, Stockholders’ Equity, for further details.

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