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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Condensed Consolidated Statements of Comprehensive Income
Net income (loss)	$ 371.6	$ 416.1	$ 887.9	$ 701.1
Other comprehensive income (loss), net:
Net unrealized gains (losses) on available-for-sale securities	790.9	2,037.7	(582.5)	626.1
Net unrealized gains (losses) on derivative instruments	13.9	(16.4)	11.7	32.2
Foreign currency translation adjustment	35.4	16.4	(20.8)	(277.9)
Net unrecognized postretirement benefit obligation	9.6	10.4	11.9	21.4
Other comprehensive income (loss)	849.8	2,048.1	(579.7)	401.8
Comprehensive income (loss)	1,221.4	2,464.2	308.2	1,102.9
Comprehensive income (loss) attributable to noncontrolling interest	9.6	16.0	8.6	2.9
Comprehensive income (loss) attributable to Principal Financial Group, Inc.	$ 1,211.8	$ 2,448.2	$ 299.6	$ 1,100.0

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