CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Income	$ 235.4	$ 886.1	$ 852.6
Change in Net Unrealized Gains on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gains on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $812.4; $522.6; $1,375.9)	1,544.4	989.0	2,593.1
Change in Net Unrealized Gains on Securities Other-Than-Temporarily Impaired (net of tax expense (benefit) of $(1.1); $(0.5); $9.3)	(2.1)	(0.9)	17.3
Total Change in Net Unrealized Gains on Securities Before Reclassification Adjustment (net of tax expense of $811.3; $522.1; $1,385.2)	1,542.3	988.1	2,610.4
Reclassification Adjustment for Net Realized Investment Gain (Loss) (net of tax expense (benefit) of $13.0; $3.5; $(79.0))	(22.5)	(6.4)	151.0
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $25.2; $(5.0); $(45.3))	47.7	(9.8)	(87.7)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $703.3; $501.0; $816.6)	(1,324.4)	(950.9)	(1,534.9)
Change in Foreign Currency Translation Adjustment (net of tax expense of $ - ; $0.6; $ -)	(10.6)	(32.2)	98.9
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $(67.4); $(12.7); $42.0)	(125.5)	12.1	75.8
Total Other Comprehensive Income	107.0	0.9	1,313.5
Comprehensive Income	$ 342.4	$ 887.0	$ 2,166.1