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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Change in accumulated other comprehensive income (loss) rollforward          
Balances       $ 11,390.0  
Balances   $ 14,034.7   14,034.7  
Change in redeemable noncontrolling interest rollforward          
Redeemable noncontrolling interest, balance at beginning of period $ 101.3 537.7 $ 127.8 391.2 $ 101.3
Net income (loss) attributable to redeemable noncontrolling interest   4.0 1.3 24.3 2.1
Redeemable noncontrolling interest of deconsolidated entities   (370.0)   (370.0) (3.2)
Contributions from redeemable noncontrolling interest   154.0 17.4 297.7 56.4
Distributions to redeemable noncontrolling interest   (25.8) (5.8) (46.1) (15.7)
Change in redemption value of redeemable noncontrolling interest   (1.0)   1.7 (0.6)
Stock-based compensation attributable to redeemable noncontrolling interest   0.1   0.1  
Other comprehensive income (loss) attributable to redeemable noncontrolling interest   5.5 (1.8) 5.6 (1.4)
Redeemable noncontrolling interest, balance at end of period   304.5 138.9 304.5 138.9
ASU 2014-09 - Revenue recognition          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change (39.7)       (39.7)
Accumulated other comprehensive income (loss)          
Change in accumulated other comprehensive income (loss) rollforward          
Balances 165.5 (418.9) (469.3) (1,565.1) 165.5
Other comprehensive income (loss) during the period, net of adjustments   1,022.5 (696.3) 2,152.6 (1,465.6)
Amounts reclassified from accumulated other comprehensive income (loss)   44.1 27.7 60.2 60.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   1,066.6 (668.6) 2,212.8 (1,405.6)
Balances   647.7 (1,137.9) 647.7 (1,137.9)
Accumulated other comprehensive income (loss) | ASU 2016-01 - Equity investments          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change (1.0)       (1.0)
Accumulated other comprehensive income (loss) | ASU 2014-09 - Revenue recognition          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         25.6
Accumulated other comprehensive income (loss) | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change 77.6       77.6
Net unrealized gains (losses) on available-for-sale securities          
Change in accumulated other comprehensive income (loss) rollforward          
Balances 1,470.7 1,294.3 914.0 190.0 1,470.7
Other comprehensive income (loss) during the period, net of adjustments   962.4 (487.0) 2,059.7 (1,308.8)
Amounts reclassified from accumulated other comprehensive income (loss)   22.4 20.9 29.4 37.2
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   984.8 (466.1) 2,089.1 (1,271.6)
Balances   2,279.1 447.9 2,279.1 447.9
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-01 - Equity investments          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         (1.0)
Net unrealized gains (losses) on available-for-sale securities | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         249.8
Noncredit component of impairment losses on fixed maturities available-for-sale          
Change in accumulated other comprehensive income (loss) rollforward          
Balances (58.3) (49.6) (64.2) (47.1) (58.3)
Other comprehensive income (loss) during the period, net of adjustments   (0.3)   (2.8)  
Amounts reclassified from accumulated other comprehensive income (loss)     0.8   10.1
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   (0.3) 0.8 (2.8) 10.1
Balances   (49.9) (63.4) (49.9) (63.4)
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         (15.2)
Net unrealized gains (losses) on derivative instruments          
Change in accumulated other comprehensive income (loss) rollforward          
Balances 42.7 59.9 34.0 64.4 42.7
Other comprehensive income (loss) during the period, net of adjustments   11.6 23.1 9.1 10.7
Amounts reclassified from accumulated other comprehensive income (loss)   (10.0) (2.8) (12.0) (4.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   1.6 20.3 (2.9) 5.9
Balances   61.5 54.3 61.5 54.3
Net unrealized gains (losses) on derivative instruments | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         5.7
Foreign currency translation adjustment          
Change in accumulated other comprehensive income (loss) rollforward          
Balances (918.5) (1,222.1) (909.8) (1,259.5) (918.5)
Other comprehensive income (loss) during the period, net of adjustments   2.5 (232.4) 40.3 (167.5)
Amounts reclassified from accumulated other comprehensive income (loss)   20.8   20.4  
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   23.3 (232.4) 60.7 (167.5)
Balances   (1,198.8) (1,142.2) (1,198.8) (1,142.2)
Foreign currency translation adjustment | ASU 2014-09 - Revenue recognition          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         25.6
Foreign currency translation adjustment | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         (81.8)
Unrecognized postretirement benefit obligation          
Change in accumulated other comprehensive income (loss) rollforward          
Balances $ (371.1) (501.4) (443.3) (512.9) (371.1)
Other comprehensive income (loss) during the period, net of adjustments   46.3   46.3  
Amounts reclassified from accumulated other comprehensive income (loss)   10.9 8.8 22.4 17.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.   57.2 8.8 68.7 17.5
Balances   $ (444.2) $ (434.5) $ (444.2) (434.5)
Unrecognized postretirement benefit obligation | ASU 2018-02 - Reclassification of certain tax effects          
Change in accumulated other comprehensive income (loss) rollforward          
Effects of implementation of accounting change         $ (80.9)