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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Net realized capital gains (losses), net of related revenue adjustments $ 668.7 $ 21.7 $ 525.5 $ 142.8
Total revenues 4,627.8 2,818.0 10,855.5 8,880.3
Pre-tax net realized capital gains (losses), as adjusted 720.7 (30.1) 570.6 50.7
Income (loss) before income taxes 1,157.8 370.7 1,937.4 1,210.4
Retirement and Income Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Inter-segment revenues 103.7 96.3 296.6 278.1
Principal Global Investors        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Inter-segment revenues 68.2 59.5 188.7 170.8
Operating Segments        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 3,978.2 2,814.4 10,392.4 8,787.4
Pre-tax operating earnings (losses) 452.9 416.4 1,420.2 1,203.9
Operating Segments | Retirement and Income Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 2,370.8 1,244.4 5,537.2 4,183.0
Pre-tax operating earnings (losses) 210.1 206.9 698.1 583.0
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 455.3 452.5 1,357.2 1,294.6
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 1,915.5 791.9 4,180.0 2,888.4
Operating Segments | Principal Global Investors        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 367.5 346.2 1,068.9 1,007.0
Pre-tax operating earnings (losses) 130.2 112.9 345.6 310.1
Operating Segments | Principal International        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 274.7 334.4 915.4 939.7
Pre-tax operating earnings (losses) 72.4 84.2 251.7 222.1
Operating Segments | U.S. Insurance Solutions        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 985.5 910.4 2,912.5 2,709.3
Pre-tax operating earnings (losses) 83.2 70.2 273.8 254.3
Operating Segments | U.S. Insurance Solutions | Specialty benefits insurance        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 550.1 510.9 1,615.9 1,492.0
Operating Segments | U.S. Insurance Solutions | Individual life insurance        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues 435.4 399.5 1,296.7 1,217.4
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)
Operating Segments | Corporate        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Operating revenues (20.3) (21.0) (41.6) (51.6)
Pre-tax operating earnings (losses) (43.0) (57.8) (149.0) (165.6)
Reconciling Items        
Operating Revenue And Profit (Loss) From Segments To Consolidated        
Net realized capital gains (losses), net of related revenue adjustments 668.7 21.7 525.5 142.8
Revenue adjustments related to equity method investments (19.1) (18.1) (62.4) (49.9)
Pre-tax net realized capital gains (losses), as adjusted 720.7 (30.1) 570.6 50.7
Earnings adjustments related to equity method investments and noncontrolling interest $ (15.8) $ (15.6) $ (53.4) $ (44.2)