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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Net realized capital gains (losses), net of related revenue adjustments $ (110.6) $ 7.5 $ (143.2) $ 121.1
Total revenues 3,178.3 3,025.7 6,227.7 6,062.3
Pre-tax net realized capital gains (losses), as adjusted (111.3) (16.0) (150.1) 80.8
Income (loss) before income taxes 365.6 399.9 779.6 839.7
Retirement and Income Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Inter-segment revenues 97.8 92.6 192.9 181.8
Principal Global Investors        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Inter-segment revenues 60.6 57.0 120.5 111.3
Operating Segments        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 3,309.5 3,035.1 6,414.2 5,973.0
Pre-tax operating earnings (losses) 494.5 431.2 967.3 787.5
Operating Segments | Retirement and Income Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 1,683.8 1,474.6 3,166.4 2,938.6
Pre-tax operating earnings (losses) 243.8 194.7 488.0 376.1
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 451.5 428.8 901.9 842.1
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 1,232.3 1,045.8 2,264.5 2,096.5
Operating Segments | Principal Global Investors        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 355.5 351.3 701.4 660.8
Pre-tax operating earnings (losses) 115.4 117.5 215.4 197.2
Operating Segments | Principal International        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 319.4 318.7 640.7 605.3
Pre-tax operating earnings (losses) 78.4 69.9 179.3 137.9
Operating Segments | U.S. Insurance Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 970.6 908.0 1,927.0 1,798.9
Pre-tax operating earnings (losses) 104.4 103.6 190.6 184.1
Operating Segments | U.S. Insurance Solutions | Specialty benefits insurance        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 537.3 498.2 1,065.8 981.1
Operating Segments | U.S. Insurance Solutions | Individual life insurance        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 433.4 409.9 861.3 817.9
Operating Segments | U.S. Insurance Solutions | U.S. Insurance Solutions Eliminations        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues (0.1) (0.1) (0.1) (0.1)
Operating Segments | Corporate        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues (19.8) (17.5) (21.3) (30.6)
Pre-tax operating earnings (losses) (47.5) (54.5) (106.0) (107.8)
Reconciling Items        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Net realized capital gains (losses), net of related revenue adjustments (110.6) 7.5 (143.2) 121.1
Revenue adjustments related to equity method investments (20.6) (16.9) (43.3) (31.8)
Pre-tax net realized capital gains (losses), as adjusted (111.3) (16.0) (150.1) 80.8
Earnings adjustments related to equity method investments and noncontrolling interest $ (17.6) $ (15.3) $ (37.6) $ (28.6)