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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Change in accumulated other comprehensive income (loss) rollforward
Balances	$ 14,618.0
Balances	12,907.5
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period	264.9	$ 391.2
Net income (loss) attributable to redeemable noncontrolling interest	(23.7)	20.3
Contributions from redeemable noncontrolling interest	34.2	143.7
Distributions to redeemable noncontrolling interest	(29.7)	(20.3)
Change in redemption value of redeemable noncontrolling interest	0.6	2.7
Other comprehensive income (loss) attributable to redeemable noncontrolling interest	(6.6)	0.1
Redeemable noncontrolling interest, balance at end of period	239.7	537.7
ASU 2016-13 - CECL
Change in accumulated other comprehensive income (loss) rollforward
Effects of implementation of accounting change	(8.4)
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	1,037.9	(1,565.1)
Other comprehensive income (loss) during the period, net of adjustments	(1,668.1)	1,130.1
Amounts reclassified from accumulated other comprehensive income (loss)	31.0	16.1
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(1,637.1)	1,146.2
Balances	(599.2)	(418.9)
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances	2,806.0	190.0
Other comprehensive income (loss) during the period, net of adjustments	(1,404.4)	1,097.3
Amounts reclassified from accumulated other comprehensive income (loss)	(6.9)	7.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(1,411.3)	1,104.3
Balances	1,350.6	1,294.3
Available-for-sale debt securities, allowance for credit losses	3.3
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-13 - CECL
Change in accumulated other comprehensive income (loss) rollforward
Effects of implementation of accounting change	(44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale
Change in accumulated other comprehensive income (loss) rollforward
Balances	(44.1)	(47.1)
Other comprehensive income (loss) during the period, net of adjustments		(2.5)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		(2.5)
Balances		(49.6)
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2016-13 - CECL
Change in accumulated other comprehensive income (loss) rollforward
Effects of implementation of accounting change	44.1
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances	53.4	64.4
Other comprehensive income (loss) during the period, net of adjustments	52.7	(2.5)
Amounts reclassified from accumulated other comprehensive income (loss)	(4.1)	(2.0)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	48.6	(4.5)
Balances	102.0	59.9
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances	(1,341.8)	(1,259.5)
Other comprehensive income (loss) during the period, net of adjustments	(316.9)	37.8
Amounts reclassified from accumulated other comprehensive income (loss)	31.5	(0.4)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	(285.4)	37.4
Balances	(1,627.2)	(1,222.1)
Unrecognized postretirement benefit obligation
Change in accumulated other comprehensive income (loss) rollforward
Balances	(435.6)	(512.9)
Other comprehensive income (loss) during the period, net of adjustments	0.5
Amounts reclassified from accumulated other comprehensive income (loss)	10.5	11.5
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.	11.0	11.5
Balances	$ (424.6)	$ (501.4)

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Amount of increase in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and beneficial interest, purchased with credit deterioration.

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