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Segment Information (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Revenues for Products and Services    
Revenues $ 2,478.6 $ 2,166.7
Net realized capital gains (losses), net of related revenue adjustments (21.1) (75.2)
Principal Global Investors
   
Operating Revenues for Products and Services    
Inter-segment revenues 73.0 58.6
Operating Segments
   
Operating Revenues for Products and Services    
Operating revenues 2,499.3 2,238.3
Operating Segments | Retirement and Investor Services
   
Operating Revenues for Products and Services    
Operating revenues 1,261.2 1,102.3
Operating Segments | Retirement and Investor Services | Total Accumulation
   
Operating Revenues for Products and Services    
Operating revenues 986.0 791.0
Operating Segments | Retirement and Investor Services | Full service accumulation
   
Operating Revenues for Products and Services    
Operating revenues 385.2 351.7
Operating Segments | Retirement and Investor Services | Principal Funds
   
Operating Revenues for Products and Services    
Operating revenues 205.4 180.6
Operating Segments | Retirement and Investor Services | Individual annuities
   
Operating Revenues for Products and Services    
Operating revenues 413.3 268.2
Operating Segments | Retirement and Investor Services | Bank and trust services
   
Operating Revenues for Products and Services    
Operating revenues 21.2 24.9
Operating Segments | Retirement and Investor Services | Accumulation Eliminations
   
Operating Revenues for Products and Services    
Operating revenues (39.1) (34.4)
Operating Segments | Retirement and Investor Services | Total Guaranteed
   
Operating Revenues for Products and Services    
Operating revenues 275.2 311.3
Operating Segments | Retirement and Investor Services | Investment only
   
Operating Revenues for Products and Services    
Operating revenues 81.6 92.4
Operating Segments | Retirement and Investor Services | Full service payout
   
Operating Revenues for Products and Services    
Operating revenues 193.6 218.9
Operating Segments | Principal Global Investors
   
Operating Revenues for Products and Services    
Operating revenues 171.1 153.7
Operating Segments | Principal International
   
Operating Revenues for Products and Services    
Operating revenues 300.4 247.5
Operating Segments | U.S. Insurance Solutions
   
Operating Revenues for Products and Services    
Operating revenues 804.4 778.0
Operating Segments | U.S. Insurance Solutions | Individual life insurance
   
Operating Revenues for Products and Services    
Operating revenues 383.8 379.5
Operating Segments | U.S. Insurance Solutions | Specialty benefits insurance
   
Operating Revenues for Products and Services    
Operating revenues 420.6 398.5
Operating Segments | Corporate
   
Operating Revenues for Products and Services    
Operating revenues (37.8) (43.2)
Reconciling Items
   
Operating Revenues for Products and Services    
Net realized capital gains (losses), net of related revenue adjustments (21.1) (75.2)
Exited group medical insurance business $ 0.4 $ 3.6