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Segment Information - Reconciliation of Segment Operating Revenues Consolidated (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Total revenues $ 16,127.7 $ 13,665.8 $ 17,536.1
Operating Segments      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenue from contracts with external customers 11,165.7 10,565.8 9,476.4
Adjustments for revenue from contracts with external customers not included in operating revenues (49.6) (67.9) (89.2)
Net investment income included in operating revenues 4,281.2 3,946.0 3,811.0
Operating revenues from equity method investments 235.0 216.3 202.2
Total revenues 15,632.3 14,660.2 13,400.4
Operating Segments | Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenue from contracts with external customers 4,957.8 4,647.5 3,667.1
Adjustments for revenue from contracts with external customers not included in operating revenues (74.7) (80.6) (89.2)
Net investment income included in operating revenues 3,040.5 2,648.1 2,322.1
Total revenues 7,976.1 7,250.2 5,899.2
Operating Segments | Principal Asset Management      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenue from contracts with external customers 1,824.5 1,775.5 1,889.4
Net investment income included in operating revenues 426.7 492.7 783.7
Operating revenues from equity method investments 235.4 216.3 202.2
Total revenues 2,790.4 2,782.3 3,181.3
Operating Segments | Benefits and Protection      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenue from contracts with external customers 4,142.5 3,938.1 3,713.2
Adjustments for revenue from contracts with external customers not included in operating revenues 25.1 12.7  
Net investment income included in operating revenues 613.6 584.4 592.2
Total revenues 4,789.0 4,551.3 4,302.8
Operating Segments | Corporate      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Revenue from contracts with external customers 240.9 204.7 206.7
Net investment income included in operating revenues 200.4 220.8 113.0
Operating revenues from equity method investments (0.4)    
Total revenues 76.8 76.4 17.1
Inter-segment eliminations      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 649.6 551.7 516.8
Total revenues (649.6) (551.7) (516.8)
Inter-segment eliminations | Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 52.5 35.2 (0.8)
Inter-segment eliminations | Principal Asset Management      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 303.8 297.8 306.0
Inter-segment eliminations | Benefits and Protection      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 7.8 16.1 (2.6)
Inter-segment eliminations | Corporate      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 285.5 202.6 214.2
Total revenues (649.6) (551.7) (516.8)
Reconciling items      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Net realized capital gains (losses), net of related revenue adjustments 102.7 57.9 (189.6)
Revenues from exited business 513.3 (927.5) 4,414.8
Adjustments related to equity method investments (74.8) (78.9) (54.5)
Market risk benefit derivative settlements $ (45.8) $ (45.9) $ (35.0)