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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Change in accumulated other comprehensive income (loss) rollforward
Balances				$ 16,558.9
Purchase of subsidiary shares from noncontrolling interest	[1]	$ (0.4)		(17.0)	$ (0.9)
Balances		16,233.1		16,233.1
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period		263.5	$ 239.7	255.6	264.9
Net income (loss) attributable to redeemable noncontrolling interest		8.6	15.7	6.8	(8.0)
Contributions from redeemable noncontrolling interest		70.2	40.4	88.0	74.6
Distributions to redeemable noncontrolling interest		(6.8)	(18.1)	(23.1)	(47.8)
Purchase of subsidiary shares from redeemable noncontrolling interest		(5.4)		(5.4)
Change in redemption value of redeemable noncontrolling interest		0.4	(2.5)	8.6	(1.9)
Other comprehensive income (loss) attributable to redeemable noncontrolling interest		0.1	(2.5)	0.1	(9.1)
Redeemable noncontrolling interest, balance at end of period		330.6	272.7	330.6	272.7
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances		953.8	(599.2)	2,383.1	1,037.9
Other comprehensive income (loss) during the period, net of adjustments		823.6	2,087.1	(590.0)	419.0
Amounts reclassified from accumulated other comprehensive income (loss)		26.4	(37.2)	10.7	(6.2)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		850.0	2,049.9	(579.3)	412.8
Balances		1,803.8	1,450.7	1,803.8	1,450.7
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances		2,764.9	1,350.6	4,138.3	2,806.0
Other comprehensive income (loss) during the period, net of adjustments		770.4	2,074.5	(581.3)	670.1
Amounts reclassified from accumulated other comprehensive income (loss)		20.5	(36.9)	(1.2)	(43.8)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		790.9	2,037.6	(582.5)	626.3
Balances		3,555.8	3,388.2	3,555.8	3,388.2
Net unrealized losses on available-for-sale debt securities with allowance for credit losses		29.3	5.7	29.3	5.7
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-13 - CECL | Effects of implementation of accounting change
Change in accumulated other comprehensive income (loss) rollforward
Balances			(44.1)		(44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale
Change in accumulated other comprehensive income (loss) rollforward
Balances					(44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2016-13 - CECL | Effects of implementation of accounting change
Change in accumulated other comprehensive income (loss) rollforward
Balances			44.1		44.1
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances		16.0	102.0	18.2	53.4
Other comprehensive income (loss) during the period, net of adjustments		17.6	(5.6)	18.9	47.1
Amounts reclassified from accumulated other comprehensive income (loss)		(3.7)	(10.8)	(7.2)	(14.9)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		13.9	(16.4)	11.7	32.2
Balances		29.9	85.6	29.9	85.6
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances		(1,368.9)	(1,627.2)	(1,312.9)	(1,341.8)
Other comprehensive income (loss) during the period, net of adjustments		35.6	18.3	(20.4)	(298.6)
Amounts reclassified from accumulated other comprehensive income (loss)					31.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		35.6	18.3	(20.4)	(267.1)
Balances		(1,333.3)	(1,608.9)	(1,333.3)	(1,608.9)
Unrecognized postretirement benefit obligation
Change in accumulated other comprehensive income (loss) rollforward
Balances		(458.2)	(424.6)	(460.5)	(435.6)
Other comprehensive income (loss) during the period, net of adjustments			(0.1)	(7.2)	0.4
Amounts reclassified from accumulated other comprehensive income (loss)		9.6	10.5	19.1	21.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		9.6	10.4	11.9	21.4
Balances		$ (448.6)	$ (414.2)	$ (448.6)	$ (414.2)
[1] Excludes amounts attributable to redeemable noncontrolling interest. See Note 9, Stockholders’ Equity, for further details.

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Amount, before tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with allowance for credit loss.

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