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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Change in accumulated other comprehensive income (loss) rollforward    
Balances $ 12,849.3  
Purchase of subsidiary shares from noncontrolling interest [1] (23.2) $ (8.9)
Balances 11,700.8  
Change in redeemable noncontrolling interest rollforward    
Redeemable noncontrolling interest, balance at beginning of period 101.3 97.5
Net income (loss) attributable to redeemable noncontrolling interest 4.1 6.9
Redeemable noncontrolling interest of deconsolidated entities (9.7) (1.4)
Contributions from redeemable noncontrolling interest 89.0 54.5
Distributions to redeemable noncontrolling interest (24.8) (28.2)
Purchase of subsidiary shares from redeemable noncontrolling interest (7.1) (4.4)
Change in redemption value of redeemable noncontrolling interest (2.7) 2.8
Stock-based compensation attributable to redeemable noncontrolling interest 0.1  
Other comprehensive income (loss) attributable to redeemable noncontrolling interest (1.7) 1.4
Redeemable noncontrolling interest, balance at end of period 148.5 129.1
ASU 2014-09 - Revenue recognition    
Change in accumulated other comprehensive income (loss) rollforward    
Effects of implementation of accounting change (39.7)  
Accumulated other comprehensive income (loss)    
Change in accumulated other comprehensive income (loss) rollforward    
Balances 165.5 (675.2)
Other comprehensive income (loss) during the period, net of adjustments (1,667.6) 669.3
Amounts reclassified from accumulated other comprehensive income (loss) 53.9 52.9
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. (1,613.7) 722.2
Purchase of subsidiary shares from noncontrolling interest [1] (1.6)  
Balances (1,347.6) 47.0
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)  
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  
Net unrealized gains (losses) on available-for-sale securities    
Change in accumulated other comprehensive income (loss) rollforward    
Balances 1,470.7 831.2
Other comprehensive income (loss) during the period, net of adjustments (1,495.3) 536.2
Amounts reclassified from accumulated other comprehensive income (loss) 24.5 32.9
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. (1,470.8) 569.1
Balances 248.7 1,400.3
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) (89.5)
Amounts reclassified from accumulated other comprehensive income (loss) 12.1 21.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 12.1 21.0
Balances (61.4) (68.5)
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 85.3
Other comprehensive income (loss) during the period, net of adjustments 17.5 (15.5)
Amounts reclassified from accumulated other comprehensive income (loss) (8.9) (13.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 8.6 (29.3)
Balances 57.0 56.0
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) (1,093.8)
Other comprehensive income (loss) during the period, net of adjustments (189.8) 148.6
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. (189.8) 148.6
Purchase of subsidiary shares from noncontrolling interest (1.6)  
Balances (1,166.1) (945.2)
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) (408.4)
Amounts reclassified from accumulated other comprehensive income (loss) 26.2 12.8
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 26.2 12.8
Balances (425.8) $ (395.6)
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)  
[1] Excludes amounts attributable to redeemable noncontrolling interest. See Note 10, Stockholders’ Equity, for further details.