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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income (loss) $ 218.9 $ 208.8
Other comprehensive income (loss), net:    
Net unrealized gains (losses) on available-for-sale securities 161.3 175.4
Noncredit component of impairment losses on fixed maturities, available-for-sale (0.9) 17.3
Net unrealized gains (losses) on derivative instruments (3.5) (4.4)
Foreign currency translation adjustment 65.3 21.8
Net unrecognized postretirement benefit obligation 8.7 49.2
Other comprehensive income (loss) 230.9 259.3
Comprehensive income (loss) 449.8 468.1
Comprehensive income (loss) attributable to noncontrolling interest 10.0 18.6
Comprehensive income (loss) attributable to Principal Financial Group, Inc. $ 439.8 $ 449.5