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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)