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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  |  | $ 14,618.0 |
Balances | $ 15,243.1 |  | 15,243.1 |
Change in redeemable noncontrolling interest rollforward |  |  |  |
Redeemable noncontrolling interest, balance at beginning of period | 239.7 | $ 537.7 | 264.9 | $ 391.2
Net income (loss) attributable to redeemable noncontrolling interest | 15.7 | 4.0 | (8.0) | 24.3
Redeemable noncontrolling interest of deconsolidated entities |  | (370.0) |  | (370.0)
Contributions from redeemable noncontrolling interest | 40.4 | 154.0 | 74.6 | 297.7
Distributions to redeemable noncontrolling interest | (18.1) | (25.8) | (47.8) | (46.1)
Change in redemption value of redeemable noncontrolling interest | (2.5) | (1.0) | (1.9) | 1.7
Stock-based compensation attributable to redeemable noncontrolling interest |  | 0.1 |  | 0.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest | (2.5) | 5.5 | (9.1) | 5.6
Redeemable noncontrolling interest, balance at end of period | 272.7 | 304.5 | 272.7 | 304.5
ASU 2016-13 - CECL |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Effects of implementation of accounting change |  |  | (8.4) |
Accumulated other comprehensive income (loss) |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (599.2) | (418.9) | 1,037.9 | (1,565.1)
Other comprehensive income (loss) during the period, net of adjustments | 2,087.1 | 1,022.5 | 419.0 | 2,152.6
Amounts reclassified from accumulated other comprehensive income (loss) | (37.2) | 44.1 | (6.2) | 60.2
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 2,049.9 | 1,066.6 | 412.8 | 2,212.8
Balances | 1,450.7 | 647.7 | 1,450.7 | 647.7
Net unrealized gains (losses) on available-for-sale securities |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 1,350.6 | 1,294.3 | 2,806.0 | 190.0
Other comprehensive income (loss) during the period, net of adjustments | 2,074.5 | 962.4 | 670.1 | 2,059.7
Amounts reclassified from accumulated other comprehensive income (loss) | (36.9) | 22.4 | (43.8) | 29.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 2,037.6 | 984.8 | 626.3 | 2,089.1
Balances | 3,388.2 | 2,279.1 | 3,388.2 | 2,279.1
Available-for-sale debt securities, allowance for credit losses | 5.7 |  | 5.7 |
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-13 - CECL |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Effects of implementation of accounting change |  |  | (44.1) |
Noncredit component of impairment losses on fixed maturities available-for-sale |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances |  | (49.6) | (44.1) | (47.1)
Other comprehensive income (loss) during the period, net of adjustments |  | (0.3) |  | (2.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. |  | (0.3) |  | (2.8)
Balances |  | (49.9) |  | (49.9)
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2016-13 - CECL |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Effects of implementation of accounting change |  |  | 44.1 |
Net unrealized gains (losses) on derivative instruments |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | 102.0 | 59.9 | 53.4 | 64.4
Other comprehensive income (loss) during the period, net of adjustments | (5.6) | 11.6 | 47.1 | 9.1
Amounts reclassified from accumulated other comprehensive income (loss) | (10.8) | (10.0) | (14.9) | (12.0)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | (16.4) | 1.6 | 32.2 | (2.9)
Balances | 85.6 | 61.5 | 85.6 | 61.5
Foreign currency translation adjustment |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (1,627.2) | (1,222.1) | (1,341.8) | (1,259.5)
Other comprehensive income (loss) during the period, net of adjustments | 18.3 | 2.5 | (298.6) | 40.3
Amounts reclassified from accumulated other comprehensive income (loss) |  | 20.8 | 31.5 | 20.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 18.3 | 23.3 | (267.1) | 60.7
Balances | (1,608.9) | (1,198.8) | (1,608.9) | (1,198.8)
Unrecognized postretirement benefit obligation |  |  |  |
Change in accumulated other comprehensive income (loss) rollforward |  |  |  |
Balances | (424.6) | (501.4) | (435.6) | (512.9)
Other comprehensive income (loss) during the period, net of adjustments | (0.1) | 46.3 | 0.4 | 46.3
Amounts reclassified from accumulated other comprehensive income (loss) | 10.5 | 10.9 | 21.0 | 22.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. | 10.4 | 57.2 | 21.4 | 68.7
Balances | $ (414.2) | $ (444.2) | $ (414.2) | $ (444.2)

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