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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Change in accumulated other comprehensive income (loss) rollforward    
Balances $ 9,311.6  
Accumulated other comprehensive income (loss), balance at beginning of period (882.5)  
Purchase of subsidiary shares from noncontrolling interest 5.8 $ (4.5)
Accumulated other comprehensive income (loss), balance at end of period (19.3)  
Balances 10,499.7  
Change in redeemable noncontrolling interest rollforward    
Redeemable noncontrolling interest, balance at beginning of period 85.7 58.0
Net income (loss) attributable to redeemable noncontrolling interest 3.2 2.1
Redeemable noncontrolling interest of newly consolidated entities 179.5  
Redeemable noncontrolling interest of deconsolidated entities (18.7)  
Contributions from redeemable noncontrolling interest 121.3 24.7
Distributions to redeemable noncontrolling interest (29.6) (4.4)
Purchase of subsidiary shares from redeemable noncontrolling interest (8.1) (6.5)
Change in redemption value of redeemable noncontrolling interest (0.4) 3.3
Foreign currency translation adjustment, redeemable noncontrolling interest 4.2 (5.6)
Redeemable noncontrolling interest, balance at end of period 337.1 71.6
Accumulated other comprehensive income (loss)    
Change in accumulated other comprehensive income (loss) rollforward    
Balances (882.5) 50.4
Other comprehensive income (loss) during the period, net of adjustments 847.8 (390.7)
Amounts reclassified from accumulated other comprehensive income (loss) 24.7 23.6
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 872.5 (367.1)
Purchase of subsidiary shares from noncontrolling interest (9.3) (9.9)
Balances (19.3) (326.6)
Net unrealized gains (losses) on available-for-sale securities    
Change in accumulated other comprehensive income (loss) rollforward    
Balances 732.1 1,202.8
Other comprehensive income (loss) during the period, net of adjustments 694.6 (243.8)
Amounts reclassified from accumulated other comprehensive income (loss) 13.0 (5.5)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 707.6 (249.3)
Balances 1,439.7 953.5
Noncredit component of impairment losses on fixed maturities available-for-sale    
Change in accumulated other comprehensive income (loss) rollforward    
Balances (86.0) (105.1)
Other comprehensive income (loss) during the period, net of adjustments (1.6)  
Amounts reclassified from accumulated other comprehensive income (loss)   16.9
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. (1.6) 16.9
Balances (87.6) (88.2)
Net unrealized gains (losses) on derivative instruments    
Change in accumulated other comprehensive income (loss) rollforward    
Balances 69.8 50.6
Other comprehensive income (loss) during the period, net of adjustments 16.8 23.5
Amounts reclassified from accumulated other comprehensive income (loss) (4.3) (11.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 12.5 11.7
Balances 82.3 62.3
Foreign currency translation adjustment    
Change in accumulated other comprehensive income (loss) rollforward    
Balances (1,148.2) (686.8)
Other comprehensive income (loss) during the period, net of adjustments 138.0 (170.4)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 138.0 (170.4)
Purchase of subsidiary shares from noncontrolling interest (9.3) (9.9)
Balances (1,019.5) (867.1)
Unrecognized postretirement benefit obligation    
Change in accumulated other comprehensive income (loss) rollforward    
Balances (450.2) (411.1)
Amounts reclassified from accumulated other comprehensive income (loss) 16.0 24.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc. 16.0 24.0
Balances $ (434.2) $ (387.1)