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Segment Information (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating Revenues for Products and Services    
Operating revenues $ 2,238.3 $ 2,107.4
Net realized capital gains (losses), net of related revenue adjustments (75.2) (30.4)
Exited group medical insurance business 3.6 18.9
Total revenues 2,166.7 2,095.9
Aggregate Segments
   
Operating Revenues for Products and Services    
Operating revenues 2,238.3 2,107.4
Retirement and Investor Services
   
Operating Revenues for Products and Services    
Operating revenues 1,102.3 1,055.1
Retirement and Investor Services | Total Accumulation
   
Operating Revenues for Products and Services    
Operating revenues 791.0 747.4
Retirement and Investor Services | Full service accumulation
   
Operating Revenues for Products and Services    
Operating revenues 351.7 332.7
Retirement and Investor Services | Principal Funds
   
Operating Revenues for Products and Services    
Operating revenues 180.6 147.1
Retirement and Investor Services | Individual annuities
   
Operating Revenues for Products and Services    
Operating revenues 268.2 272.3
Retirement and Investor Services | Bank and trust services
   
Operating Revenues for Products and Services    
Operating revenues 24.9 24.5
Retirement and Investor Services | Accumulation Eliminations
   
Operating Revenues for Products and Services    
Operating revenues (34.4) (29.2)
Retirement and Investor Services | Total Guaranteed
   
Operating Revenues for Products and Services    
Operating revenues 311.3 307.7
Retirement and Investor Services | Investment only
   
Operating Revenues for Products and Services    
Operating revenues 92.4 115.3
Retirement and Investor Services | Full service payout
   
Operating Revenues for Products and Services    
Operating revenues 218.9 192.4
Principal Global Investors
   
Operating Revenues for Products and Services    
Operating revenues 153.7 138.1
Inter-segment revenues 58.6 52.6
Principal International
   
Operating Revenues for Products and Services    
Operating revenues 247.5 262.5
U.S. Insurance Solutions
   
Operating Revenues for Products and Services    
Operating revenues 778.0 697.0
U.S. Insurance Solutions | Individual life insurance
   
Operating Revenues for Products and Services    
Operating revenues 379.5 313.5
U.S. Insurance Solutions | Specialty benefits insurance
   
Operating Revenues for Products and Services    
Operating revenues 398.5 383.5
Corporate
   
Operating Revenues for Products and Services    
Operating revenues $ (43.2) $ (45.3)