Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Consolidated Statements of Comprehensive Income
Net income (loss)	$ 380.7	$ 516.3
Other comprehensive income (loss), net:
Net unrealized gains (losses) on available-for-sale securities	(3,673.9)	(1,373.4)
Net unrealized gains (losses) on derivative instruments	(16.3)	(2.2)
Foreign currency translation adjustment	153.4	(56.2)
Net unrecognized postretirement benefit obligation	6.7	2.3
Other comprehensive income (loss)	(3,530.1)	(1,429.5)
Comprehensive income (loss)	(3,149.4)	(913.2)
Comprehensive income (loss) attributable to noncontrolling interest	5.9	(1.0)
Comprehensive loss attributable to Principal Financial Group, Inc.	$ (3,155.3)	$ (912.2)