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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Comprehensive Income      
Net income (loss) $ 824.7 $ 688.9 $ 680.8
Other comprehensive income (loss), net:      
Net unrealized gains (losses) on available-for-sale securities 557.6 208.6 1,113.5
Noncredit component of impairment losses on fixed maturities, available-for-sale (6.7) 31.0 (33.7)
Net unrealized gains (losses) on derivative instruments (43.6) 23.6 12.9
Foreign currency translation adjustment (4.8) (139.5) 31.9
Net unrecognized postretirement benefit obligation (127.4) (172.9) 208.0
Other comprehensive income (loss) 375.1 (49.2) 1,332.6
Comprehensive income (loss) 1,199.8 639.7 2,013.4
Comprehensive income (loss) attributable to noncontrolling interest 20.0 35.7 18.1
Comprehensive income (loss) attributable to Principal Financial Group, Inc. $ 1,179.8 $ 604.0 $ 1,995.3