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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  |  | $ 16,558.9 |
Purchase of subsidiary shares from noncontrolling interest | [1] | $ (1.1) |  | (18.1) | $ (0.9)
Balances |  | 16,070.7 |  | 16,070.7 |
Change in redeemable noncontrolling interest rollforward |  |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period |  | 330.6 | $ 272.7 | 255.6 | 264.9
Net income (loss) attributable to redeemable noncontrolling interest |  | 2.7 | (1.5) | 9.5 | (9.5)
Contributions from redeemable noncontrolling interest |  | 60.2 | 49.7 | 148.2 | 124.3
Distributions to redeemable noncontrolling interest |  | (11.7) | (6.0) | (34.8) | (53.8)
Purchase of subsidiary shares from redeemable noncontrolling interest |  | (0.7) |  | (6.1) |
Change in redemption value of redeemable noncontrolling interest |  |  | 1.7 | 8.6 | (0.2)
Other comprehensive income (loss) attributable to redeemable noncontrolling interest |  | (0.4) | 9.1 | (0.3) |
Redeemable noncontrolling interest, balance at end of period |  | 343.3 | 278.5 | 343.3 | 278.5
Redeemable noncontrolling interest of deconsolidated entities |  | (37.4) | (47.3) | (37.4) | (47.3)
Stock-based compensation attributable to redeemable noncontrolling interest |  |  | 0.1 |  | 0.1
Accumulated other comprehensive income (loss) |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 1,803.8 | 1,450.7 | 2,383.1 | 1,037.9
Other comprehensive income (loss) during the period, net of adjustments |  | (188.4) | 283.1 | (778.4) | 702.1
Amounts reclassified from accumulated other comprehensive income (loss) |  | 3.8 | 13.3 | 14.5 | 7.1
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (184.6) | 296.4 | (763.9) | 709.2
Balances |  | 1,619.2 | 1,747.1 | 1,619.2 | 1,747.1
Net unrealized gains (losses) on available-for-sale securities |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 3,555.8 | 3,388.2 | 4,138.3 | 2,806.0
Other comprehensive income (loss) during the period, net of adjustments |  | (21.2) | 224.7 | (602.5) | 894.8
Amounts reclassified from accumulated other comprehensive income (loss) |  | (2.4) | 1.9 | (3.6) | (41.9)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (23.6) | 226.6 | (606.1) | 852.9
Balances |  | 3,532.2 | 3,614.8 | 3,532.2 | 3,614.8
Net unrealized losses on available-for-sale debt securities with allowance for credit losses |  | 16.2 | 4.0 | 16.2 | 4.0
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-13 - CECL | Effects of implementation of accounting change |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  | (44.1) |  | (44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  |  |  | (44.1)
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.0 |  |  |
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  |  |  | 0.0 |
Balances |  | 0.0 |  | 0.0 |
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2016-13 - CECL | Effects of implementation of accounting change |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  | 44.1 |  | 44.1
Net unrealized gains (losses) on derivative instruments |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 29.9 | 85.6 | 18.2 | 53.4
Other comprehensive income (loss) during the period, net of adjustments |  | 23.8 | (21.4) | 42.7 | 25.7
Amounts reclassified from accumulated other comprehensive income (loss) |  | (3.1) | (3.7) | (10.3) | (18.6)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 20.7 | (25.1) | 32.4 | 7.1
Balances |  | 50.6 | 60.5 | 50.6 | 60.5
Foreign currency translation adjustment |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (1,333.3) | (1,608.9) | (1,312.9) | (1,341.8)
Other comprehensive income (loss) during the period, net of adjustments |  | (191.0) | 79.8 | (211.4) | (218.8)
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.0 | 4.6 |  | 36.1
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (191.0) | 84.4 | (211.4) | (182.7)
Balances |  | (1,524.3) | (1,524.5) | (1,524.3) | (1,524.5)
Unrecognized postretirement benefit obligations |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (448.6) | (414.2) | (460.5) | (435.6)
Other comprehensive income (loss) during the period, net of adjustments |  |  |  | (7.2) | 0.4
Amounts reclassified from accumulated other comprehensive income (loss) |  | 9.3 | 10.5 | 28.4 | 31.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 9.3 | 10.5 | 21.2 | 31.9
Balances |  | $ (439.3) | $ (403.7) | $ (439.3) | $ (403.7)
[1] | Excludes amounts attributable to redeemable noncontrolling interest. See Note 9, Stockholders’ Equity, for further details.

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