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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Net realized capital gains (losses), net of related revenue adjustments $ 132.3 $ 83.7
Total revenues 4,551.3 3,743.9
Pre-tax net realized capital gains (losses), as adjusted (67.1) 65.6
Income (loss) before income taxes 328.2 526.0
Retirement and Income Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Inter-segment revenues 84.0 85.7
Principal Global Investors    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Inter-segment revenues 72.7 61.5
Operating Segments    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 4,429.6 3,680.7
Pre-tax operating earnings (losses) 386.0 478.7
Operating Segments | Retirement and Income Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 2,605.7 1,891.9
Pre-tax operating earnings (losses) 205.1 240.6
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 543.1 430.8
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 2,062.6 1,461.1
Operating Segments | Principal Global Investors    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 390.8 339.0
Pre-tax operating earnings (losses) 111.7 100.7
Operating Segments | Principal International    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 300.5 380.5
Pre-tax operating earnings (losses) 30.8 111.1
Operating Segments | U.S. Insurance Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 1,123.3 1,068.1
Pre-tax operating earnings (losses) 129.5 110.7
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 639.0 601.8
Operating Segments | U.S. Insurance Solutions | Individual Life insurance    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 484.3 466.3
Operating Segments | Corporate    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 9.3 1.2
Pre-tax operating earnings (losses) (91.1) (84.4)
Reconciling Items    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Net realized capital gains (losses), net of related revenue adjustments 132.3 83.7
Adjustments related to equity method investments (10.6) (20.5)
Pre-tax net realized capital gains (losses), as adjusted (67.1) 65.6
Earnings adjustments related to equity method investments and noncontrolling interest $ 9.3 $ (18.3)