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Segment Information (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating Revenues for Products and Services        
Operating revenues $ 2,315.8 $ 2,638.6 $ 6,865.8 $ 6,882.3
Net realized capital gains (losses), net of related revenue adjustments (76.7) 64.9 (253.4) 12.8
Exited group medical insurance business 0.5 1.2 4.5 24.1
Total revenues 2,239.6 2,704.7 6,616.9 6,919.2
Aggregate Segments
       
Operating Revenues for Products and Services        
Operating revenues 2,315.8 2,638.6 6,865.8 6,882.3
Retirement and Investor Services
       
Operating Revenues for Products and Services        
Operating revenues 1,136.5 1,570.7 3,387.6 3,707.0
Retirement and Investor Services | Total Accumulation
       
Operating Revenues for Products and Services        
Operating revenues 885.3 793.6 2,501.2 2,310.4
Retirement and Investor Services | Full service accumulation
       
Operating Revenues for Products and Services        
Operating revenues 369.9 339.0 1,087.7 1,006.1
Retirement and Investor Services | Principal Funds
       
Operating Revenues for Products and Services        
Operating revenues 194.8 156.8 565.9 453.0
Retirement and Investor Services | Individual annuities
       
Operating Revenues for Products and Services        
Operating revenues 334.5 302.1 881.8 864.0
Retirement and Investor Services | Bank and trust services
       
Operating Revenues for Products and Services        
Operating revenues 24.4 26.1 74.9 75.9
Retirement and Investor Services | Accumulation Eliminations
       
Operating Revenues for Products and Services        
Operating revenues (38.3) (30.4) (109.1) (88.6)
Retirement and Investor Services | Total Guaranteed
       
Operating Revenues for Products and Services        
Operating revenues 251.2 777.1 886.4 1,396.6
Retirement and Investor Services | Investment only
       
Operating Revenues for Products and Services        
Operating revenues 83.1 105.2 260.6 328.8
Retirement and Investor Services | Full service payout
       
Operating Revenues for Products and Services        
Operating revenues 168.1 671.9 625.8 1,067.8
Principal Global Investors
       
Operating Revenues for Products and Services        
Operating revenues 160.9 144.0 482.8 423.2
Inter-segment revenues 61.1 54.1 179.9 160.0
Principal International
       
Operating Revenues for Products and Services        
Operating revenues 303.3 203.8 825.9 676.9
U.S. Insurance Solutions
       
Operating Revenues for Products and Services        
Operating revenues 767.6 766.5 2,318.6 2,215.0
U.S. Insurance Solutions | Individual life insurance
       
Operating Revenues for Products and Services        
Operating revenues 362.7 372.6 1,110.2 1,044.8
U.S. Insurance Solutions | Specialty benefits insurance
       
Operating Revenues for Products and Services        
Operating revenues 405.0 393.9 1,208.6 1,170.2
U.S. Insurance Solutions | U.S. Insurance Solutions Eliminations
       
Operating Revenues for Products and Services        
Operating revenues (0.1)   (0.2)  
Corporate
       
Operating Revenues for Products and Services        
Operating revenues $ (52.5) $ (46.4) $ (149.1) $ (139.8)