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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  |  |  | $ 16,558.9 |
Purchase of subsidiary shares from noncontrolling interest | [1] | $ (0.4) |  | (17.0) | $ (0.9)
Balances |  | 16,233.1 |  | 16,233.1 |
Change in redeemable noncontrolling interest rollforward |  |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period |  | 263.5 | $ 239.7 | 255.6 | 264.9
Net income (loss) attributable to redeemable noncontrolling interest |  | 8.6 | 15.7 | 6.8 | (8.0)
Contributions from redeemable noncontrolling interest |  | 70.2 | 40.4 | 88.0 | 74.6
Distributions to redeemable noncontrolling interest |  | (6.8) | (18.1) | (23.1) | (47.8)
Purchase of subsidiary shares from redeemable noncontrolling interest |  | (5.4) |  | (5.4) |
Change in redemption value of redeemable noncontrolling interest |  | 0.4 | (2.5) | 8.6 | (1.9)
Other comprehensive income (loss) attributable to redeemable noncontrolling interest |  | 0.1 | (2.5) | 0.1 | (9.1)
Redeemable noncontrolling interest, balance at end of period |  | 330.6 | 272.7 | 330.6 | 272.7
Accumulated other comprehensive income (loss) |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 953.8 | (599.2) | 2,383.1 | 1,037.9
Other comprehensive income (loss) during the period, net of adjustments |  | 823.6 | 2,087.1 | (590.0) | 419.0
Amounts reclassified from accumulated other comprehensive income (loss) |  | 26.4 | (37.2) | 10.7 | (6.2)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 850.0 | 2,049.9 | (579.3) | 412.8
Balances |  | 1,803.8 | 1,450.7 | 1,803.8 | 1,450.7
Net unrealized gains (losses) on available-for-sale securities |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | 2,764.9 | 1,350.6 | 4,138.3 | 2,806.0
Other comprehensive income (loss) during the period, net of adjustments |  | 770.4 | 2,074.5 | (581.3) | 670.1
Amounts reclassified from accumulated other comprehensive income (loss) |  | 20.5 | (36.9) | (1.2) | (43.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 790.9 | 2,037.6 | (582.5) | 626.3
Balances |  | 3,555.8 | 3,388.2 | 3,555.8 | 3,388.2
Net unrealized losses on available-for-sale debt securities with allowance for credit losses |  | 29.3 | 5.7 | 29.3 | 5.7
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)
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 |  | 16.0 | 102.0 | 18.2 | 53.4
Other comprehensive income (loss) during the period, net of adjustments |  | 17.6 | (5.6) | 18.9 | 47.1
Amounts reclassified from accumulated other comprehensive income (loss) |  | (3.7) | (10.8) | (7.2) | (14.9)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 13.9 | (16.4) | 11.7 | 32.2
Balances |  | 29.9 | 85.6 | 29.9 | 85.6
Foreign currency translation adjustment |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (1,368.9) | (1,627.2) | (1,312.9) | (1,341.8)
Other comprehensive income (loss) during the period, net of adjustments |  | 35.6 | 18.3 | (20.4) | (298.6)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  | 31.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 35.6 | 18.3 | (20.4) | (267.1)
Balances |  | (1,333.3) | (1,608.9) | (1,333.3) | (1,608.9)
Unrecognized postretirement benefit obligation |  |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |  |
Balances |  | (458.2) | (424.6) | (460.5) | (435.6)
Other comprehensive income (loss) during the period, net of adjustments |  |  | (0.1) | (7.2) | 0.4
Amounts reclassified from accumulated other comprehensive income (loss) |  | 9.6 | 10.5 | 19.1 | 21.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | 9.6 | 10.4 | 11.9 | 21.4
Balances |  | $ (448.6) | $ (414.2) | $ (448.6) | $ (414.2)
[1] | Excludes amounts attributable to redeemable noncontrolling interest. See Note 9, Stockholders’ Equity, for further details.

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