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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information    
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
Net realized capital gains (losses), as adjusted (10.0) (54.9)
Other after-tax adjustments (1.5) 17.1
Net income (loss) available to common stockholders 201.5 182.0
After-tax gains (losses) associated with exited group medical insurance business that does not qualify for discontinued operations (1.5) 17.1
Aggregate Segments
   
Segment Reporting Information    
Operating revenues 2,107.4 2,047.5
Operating earnings (loss) 213.0 219.8
Retirement and Investor Services
   
Segment Reporting Information    
Operating revenues 1,055.1 1,017.9
Operating earnings (loss) 143.6 154.1
Principal Global Investors
   
Segment Reporting Information    
Operating revenues 138.1 125.3
Operating earnings (loss) 16.2 16.6
Principal International
   
Segment Reporting Information    
Operating revenues 262.5 206.1
Operating earnings (loss) 41.8 27.8
U.S. Insurance Solutions
   
Segment Reporting Information    
Operating revenues 697.0 732.0
Operating earnings (loss) 50.2 53.4
Corporate
   
Segment Reporting Information    
Operating revenues (45.3) (33.8)
Operating earnings (loss) $ (38.8) $ (32.1)