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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Net realized capital gains (losses), net of related revenue adjustments $ (164.0) $ 195.3 $ (98.5)
Total revenues 14,262.7 14,741.7 16,222.1
Pre-tax net realized capital gains (losses), as adjusted (179.8) 63.6 (140.9)
Income before income taxes 2,083.6 1,693.5 1,693.3
Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 413.1 342.6 357.8
Principal Global Investors      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Inter-segment revenues 308.9 273.8 264.9
Operating Segments      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 14,458.2 14,579.9 16,393.1
Pre-tax operating earnings (losses) 2,261.4 1,636.9 1,889.3
Operating Segments | Retirement and Income Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 6,510.0 7,503.5 8,954.4
Pre-tax operating earnings (losses) 1,141.2 966.9 874.0
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 2,322.7 2,149.8 2,003.0
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 4,187.3 5,353.7 6,951.4
Operating Segments | Principal Global Investors      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1,828.0 1,539.1 1,505.8
Pre-tax operating earnings (losses) 708.4 512.9 483.3
Operating Segments | Principal International      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1,351.8 1,096.8 1,523.2
Pre-tax operating earnings (losses) 309.0 243.6 390.7
Operating Segments | U.S. Insurance Solutions      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 4,766.6 4,480.2 4,449.0
Pre-tax operating earnings (losses) 470.8 239.9 521.6
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 2,709.6 2,525.4 2,493.6
Operating Segments | U.S. Insurance Solutions | Individual Life insurance      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 2,057.2 1,955.0 1,955.6
Operating Segments | U.S. Insurance Solutions | Eliminations      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues (0.2) (0.2) (0.2)
Operating Segments | Corporate      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Operating revenues 1.8 (39.7) (39.3)
Pre-tax operating earnings (losses) (368.0) (326.4) (380.3)
Reconciling Items      
Operating Revenue And Profit (Loss) From Segments To Consolidated      
Net realized capital gains (losses), net of related revenue adjustments (164.0) 195.3 (98.5)
Adjustments related to equity method investments (31.5) (33.5) (72.5)
Pre-tax net realized capital gains (losses), as adjusted (179.8) 63.6 (140.9)
Earnings adjustments related to equity method investments and noncontrolling interest $ 2.0 $ (7.0) $ (55.1)