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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Change in accumulated other comprehensive income (loss) rollforward
Balances			$ 10,916.0
Balances	$ 11,013.4		11,013.4
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period	370.8	$ 272.7	248.9	$ 262.0
Net income (loss) attributable to redeemable noncontrolling interest	2.8	3.6	0.8	8.1
Redeemable noncontrolling interest of deconsolidated entities	(95.5)	(0.6)	(185.5)	(3.0)
Contributions from redeemable noncontrolling interest	14.9	4.3	241.1	23.3
Distributions to redeemable noncontrolling interest	(13.8)	(14.4)	(28.0)	(22.8)
Purchase of subsidiary shares from redeemable noncontrolling interest	(0.6)		(0.6)	(1.6)
Change in redemption value of redeemable noncontrolling interest	(1.0)	0.7	1.1	0.1
Stock-based compensation attributable to redeemable noncontrolling interest	0.1		0.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest	(0.3)	0.4	(0.5)	0.6
Redeemable noncontrolling interest, balance at end of period	277.4	266.7	277.4	266.7
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(5,256.1)	(6,201.3)	(5,345.3)	(6,879.0)
Other comprehensive income (loss) during the period, net of adjustments	(193.5)	(130.8)	(141.6)	483.9
Amounts reclassified to accumulated other comprehensive income (loss)	37.8	86.9	75.1	149.9
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(155.7)	(43.9)	(66.5)	633.8
Balances	(5,411.8)	(6,245.2)	(5,411.8)	(6,245.2)
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances	(4,373.4)	(4,779.8)	(4,014.8)	(5,857.9)
Other comprehensive income (loss) during the period, net of adjustments	(555.3)	(625.5)	(948.4)	390.5
Amounts reclassified to accumulated other comprehensive income (loss)	34.5	83.1	69.0	145.2
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(520.8)	(542.4)	(879.4)	535.7
Balances	(4,894.2)	(5,322.2)	(4,894.2)	(5,322.2)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses	2.4	1.9	2.4	1.9
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances	15.4	39.7	(2.1)	39.7
Other comprehensive income (loss) during the period, net of adjustments	24.7	(4.8)	42.9	(1.9)
Amounts reclassified to accumulated other comprehensive income (loss)	(0.7)	(1.0)	(1.4)	(3.9)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	24.0	(5.8)	41.5	(5.8)
Balances	39.4	33.9	39.4	33.9
Liability for future policy benefits discount rate remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	982.9	200.0	428.2	740.9
Other comprehensive income (loss) during the period, net of adjustments	393.5	509.2	948.2	(31.7)
Amounts reclassified to accumulated other comprehensive income (loss)			0.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	393.5	509.2	948.2	(31.7)
Balances	1,376.4	709.2	1,376.4	709.2
Market risk benefit nonperformance risk remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(15.6)	30.0	(6.9)	24.0
Other comprehensive income (loss) during the period, net of adjustments	1.1	(5.6)	(7.6)	0.4
Amounts reclassified to accumulated other comprehensive income (loss)			0.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	1.1	(5.6)	(7.6)	0.4
Balances	(14.5)	24.4	(14.5)	24.4
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances	(1,617.2)	(1,440.9)	(1,498.0)	(1,571.6)
Other comprehensive income (loss) during the period, net of adjustments	(55.3)	9.5	(174.5)	140.2
Amounts reclassified to accumulated other comprehensive income (loss)		0.3	0.0	0.3
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(55.3)	9.8	(174.5)	140.5
Balances	(1,672.5)	(1,431.1)	(1,672.5)	(1,431.1)
Unrecognized postretirement benefit obligations
Change in accumulated other comprehensive income (loss) rollforward
Balances	(248.2)	(250.3)	(251.7)	(254.1)
Other comprehensive income (loss) during the period, net of adjustments	(2.2)	(13.6)	(2.2)	(13.6)
Amounts reclassified to accumulated other comprehensive income (loss)	4.0	4.5	7.5	8.3
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	1.8	(9.1)	5.3	(5.3)
Balances	$ (246.4)	$ (259.4)	$ (246.4)	$ (259.4)

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