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Segment Information (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating Revenues for Products and Services    
Operating revenues $ 2,107.4 $ 2,047.5
Net realized capital gains (losses), net of related revenue adjustments (30.4) (80.5)
Exited group medical insurance business 18.9 254.9
Total revenues 2,095.9 2,221.9
Aggregate Segments
   
Operating Revenues for Products and Services    
Operating revenues 2,107.4 2,047.5
Retirement and Investor Services
   
Operating Revenues for Products and Services    
Operating revenues 1,055.1 1,017.9
Retirement and Investor Services | Total Accumulation
   
Operating Revenues for Products and Services    
Operating revenues 747.4 754.1
Retirement and Investor Services | Full service accumulation
   
Operating Revenues for Products and Services    
Operating revenues 332.7 343.4
Retirement and Investor Services | Principal Funds
   
Operating Revenues for Products and Services    
Operating revenues 147.1 141.6
Retirement and Investor Services | Individual annuities
   
Operating Revenues for Products and Services    
Operating revenues 272.3 274.2
Retirement and Investor Services | Bank and trust services
   
Operating Revenues for Products and Services    
Operating revenues 24.5 23.8
Retirement and Investor Services | Accumulation Eliminations
   
Operating Revenues for Products and Services    
Operating revenues (29.2) (28.9)
Retirement and Investor Services | Total Guaranteed
   
Operating Revenues for Products and Services    
Operating revenues 307.7 263.8
Retirement and Investor Services | Investment only
   
Operating Revenues for Products and Services    
Operating revenues 115.3 135.6
Retirement and Investor Services | Full service payout
   
Operating Revenues for Products and Services    
Operating revenues 192.4 128.2
Principal Global Investors
   
Operating Revenues for Products and Services    
Operating revenues 138.1 125.3
Inter-segment revenues 52.6 51.7
Principal International
   
Operating Revenues for Products and Services    
Operating revenues 262.5 206.1
U.S. Insurance Solutions
   
Operating Revenues for Products and Services    
Operating revenues 697.0 732.0
U.S. Insurance Solutions | Individual life insurance
   
Operating Revenues for Products and Services    
Operating revenues 313.5 358.3
U.S. Insurance Solutions | Specialty benefits insurance
   
Operating Revenues for Products and Services    
Operating revenues 383.5 373.7
Corporate
   
Operating Revenues for Products and Services    
Operating revenues $ (45.3) $ (33.8)