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Segment Information (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information        
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
Operating earnings (loss) 269.2 142.3 773.9 568.5
Net realized capital gains (losses), as adjusted (22.8) 88.8 (126.8) 39.6
Other after-tax adjustments (0.7) (43.9) (0.8) (49.4)
Net income (loss) available to common stockholders 245.7 187.2 646.3 558.7
Contribution to The Principal Financial Group Foundation, Inc.   (39.8)   (39.8)
After-tax gains (losses) associated with exited group medical insurance business that does not qualify for discontinued operations (0.7) (4.1) (0.8) (9.6)
Aggregate Segments
       
Segment Reporting Information        
Operating revenues 2,315.8 2,638.6 6,865.8 6,882.3
Operating earnings (loss) 269.2 142.3 773.9 568.5
Retirement and Investor Services
       
Segment Reporting Information        
Operating revenues 1,136.5 1,570.7 3,387.6 3,707.0
Operating earnings (loss) 172.9 137.5 515.2 422.8
Principal Global Investors
       
Segment Reporting Information        
Operating revenues 160.9 144.0 482.8 423.2
Operating earnings (loss) 23.1 20.6 72.4 55.0
Principal International
       
Segment Reporting Information        
Operating revenues 303.3 203.8 825.9 676.9
Operating earnings (loss) 50.7 37.0 153.6 112.6
U.S. Insurance Solutions
       
Segment Reporting Information        
Operating revenues 767.6 766.5 2,318.6 2,215.0
Operating earnings (loss) 54.0 (21.6) 136.9 78.8
Corporate
       
Segment Reporting Information        
Operating revenues (52.5) (46.4) (149.1) (139.8)
Operating earnings (loss) $ (31.5) $ (31.2) $ (104.2) $ (100.7)