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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenues from exited business $ (927.5) $ 4,414.8  
Total revenues 13,665.8 17,536.1 $ 14,427.8
Pre-tax income (loss) from exited business (1,129.8) 4,260.1  
Income (loss) before income taxes 738.8 5,987.0 1,910.9
Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 398.3 364.4 413.1
Principal Asset Management      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 297.8 306.0 287.4
Operating Segments      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 14,660.2 13,400.4 14,442.7
Pre-tax operating earnings (losses) 2,009.9 1,962.7 2,007.6
Pre-tax income (loss) from exited business (1,129.8) 4,260.1  
Operating Segments | Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 7,250.2 5,899.2 6,429.4
Pre-tax operating earnings (losses) 1,051.4 959.1 972.6
Operating Segments | Principal Asset Management      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 2,782.3 3,181.3 3,193.0
Pre-tax operating earnings (losses) 817.7 902.7 1,036.1
Operating Segments | Principal Asset Management | Principal International      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1,192.8 1,489.4 1,391.1
Operating Segments | Principal Asset Management | Principal Global Investors      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1,611.2 1,715.5 1,828.0
Operating Segments | Principal Asset Management | Eliminations      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues (21.7) (23.6) (26.1)
Operating Segments | Benefits and Protection      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 4,551.3 4,302.8 4,792.4
Pre-tax operating earnings (losses) 537.6 570.3 366.9
Operating Segments | Benefits and Protection | Specialty Benefits      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 3,229.4 2,984.6 2,709.6
Operating Segments | Benefits and Protection | Life Insurance      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1,323.7 1,318.8 2,083.0
Operating Segments | Benefits and Protection | Eliminations      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues (1.8) (0.6) (0.2)
Operating Segments | Corporate      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 76.4 17.1 27.9
Pre-tax operating earnings (losses) (396.8) (469.4) (368.0)
Reconciling Items      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Net realized capital gains (losses), net of related revenue adjustments 57.9 (189.6) 64.8
Revenues from exited business (927.5) 4,414.8  
Adjustments related to equity method investments (78.9) (54.5) (47.2)
Market risk benefit derivative settlements (45.9) (35.0) (32.5)
Pre-tax net realized capital gains (losses), as adjusted (88.6) (251.4) (83.0)
Earnings adjustments related to equity method investments and noncontrolling interest $ (52.7) $ 15.6 $ (13.7)