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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Net realized capital gains (losses), net of related revenue adjustments $ (32.6) $ 113.6
Total revenues 3,049.4 3,036.6
Pre-tax net realized capital gains (losses), as adjusted (38.8) 96.8
Income (loss) before income taxes 414.0 439.8
Retirement and Income Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Inter-segment revenues 95.1 89.2
Principal Global Investors    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Inter-segment revenues 59.9 54.3
Operating Segments    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 3,104.7 2,937.9
Pre-tax operating earnings (losses) 472.8 356.3
Operating Segments | Retirement and Income Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 1,482.6 1,464.0
Pre-tax operating earnings (losses) 244.2 181.4
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 450.4 413.3
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 1,032.2 1,050.7
Operating Segments | Principal Global Investors    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 345.9 309.5
Pre-tax operating earnings (losses) 100.0 79.7
Operating Segments | Principal International    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 321.3 286.6
Pre-tax operating earnings (losses) 100.9 68.0
Operating Segments | U.S. Insurance Solutions    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 956.4 890.9
Pre-tax operating earnings (losses) 86.2 80.5
Operating Segments | U.S. Insurance Solutions | Specialty benefits insurance    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 528.5 482.9
Operating Segments | U.S. Insurance Solutions | Individual life insurance    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues 427.9 408.0
Operating Segments | Corporate    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Operating revenues (1.5) (13.1)
Pre-tax operating earnings (losses) (58.5) (53.3)
Reconciling Items    
Operating Revenue And Profit (Loss) From Segments To Consolidated    
Net realized capital gains (losses), net of related revenue adjustments (32.6) 113.6
Revenue adjustments related to equity method investments (22.7) (14.9)
Pre-tax net realized capital gains (losses), as adjusted (38.8) 96.8
Earnings adjustments related to equity method investments and noncontrolling interest $ (20.0) $ (13.3)