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Segment Information - Reconciliation of Segment Operating Revenues and Earnings to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Net realized capital gains (losses), net of related revenue adjustments                 $ (132.3) $ 472.2 $ 80.9
Total revenues $ 3,770.6 $ 4,348.1 $ 3,234.9 $ 2,883.6 $ 3,237.7 $ 4,627.8 $ 3,178.3 $ 3,049.4 14,237.2 14,093.2 12,394.1
Pre-tax net realized capital gains (losses), as adjusted                 (126.4) 520.3 46.3
Income (loss) before income taxes                 1,784.4 2,252.2 1,591.7
Retirement and Income Solutions                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Inter-segment revenues                 393.6 402.8 373.3
Principal Global Investors                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Inter-segment revenues                 262.8 250.9 235.7
Operating Segments                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 14,424.8 13,703.3 12,380.8
Pre-tax operating earnings (losses)                 1,954.5 1,873.7 1,668.7
Operating Segments | Retirement and Income Solutions                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 7,285.9 7,165.6 6,150.7
Pre-tax operating earnings (losses)                 880.6 899.8 794.5
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 1,831.0 1,821.0 1,743.2
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 5,454.9 5,344.6 4,407.5
Operating Segments | Principal Global Investors                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 1,736.3 1,444.4 1,387.1
Pre-tax operating earnings (losses)                 553.2 469.7 443.8
Operating Segments | Principal International                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 1,372.9 1,251.5 1,252.0
Pre-tax operating earnings (losses)                 255.7 330.0 288.1
Operating Segments | U.S. Insurance Solutions                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 4,080.9 3,902.6 3,637.3
Pre-tax operating earnings (losses)                 443.6 384.7 361.2
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 2,329.4 2,171.8 2,011.4
Operating Segments | U.S. Insurance Solutions | Individual Life insurance                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Operating revenues                 1,751.7 1,731.0 1,626.1
Operating Segments | U.S. Insurance Solutions | 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                 (51.2) (60.8) (46.3)
Pre-tax operating earnings (losses)                 (178.6) (210.5) (218.9)
Reconciling Items                      
Operating Revenue And Profit (Loss) From Segments To Consolidated                      
Net realized capital gains (losses), net of related revenue adjustments                 (132.3) 472.2 80.9
Revenue adjustments related to equity method investments                 (55.3) (82.3) (67.6)
Pre-tax net realized capital gains (losses), as adjusted                 (126.4) 520.3 46.3
Pre-tax other adjustments                   (70.0) (86.4)
Earnings adjustments related to equity method investments and noncontrolling interest                 $ (43.7) $ (71.8) $ (36.9)