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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated Statements of Comprehensive Income      
Net income (loss) $ 1,757.4 $ 1,428.5 $ 1,444.1
Other comprehensive income (loss), net:      
Net unrealized gains (losses) on available-for-sale securities (670.9) 1,376.5 2,616.1
Noncredit component of impairment losses on fixed maturities, available-for-sale     3.0
Net unrealized gains (losses) on derivative instruments 33.6 (35.2) (11.0)
Foreign currency translation adjustment (254.2) 30.6 (78.7)
Net unrecognized postretirement benefit obligation 115.8 (24.9) 77.3
Other comprehensive income (loss) (775.7) 1,347.0 2,606.7
Comprehensive income (loss) 981.7 2,775.5 4,050.8
Comprehensive income (loss) attributable to noncontrolling interest 43.3 34.5 53.6
Comprehensive income (loss) attributable to Principal Financial Group, Inc. $ 938.4 $ 2,741.0 $ 3,997.2