CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Change in Net Unrealized Gains and Losses on Securities Not Other-Than-Temporarily Impaired, tax expense	$ 196.0	$ 440.0	$ 155.3	$ 597.2
Change in Net Unrealized Gains and Losses on Securities Other-Than-Temporarily Impaired, tax benefit	0	(0.5)	(1.1)	0.5
Total Change in Net Unrealized Gains and Losses on Securities Before Reclassification Adjustment, tax expense	196.0	439.5	154.2	596.7
Reclassification Adjustment for Net Realized Investment (Gain) Loss, tax expense (benefit)	0.7	(0.6)	1.2	0.7
Change in Net Gain on Cash Flow Hedges, tax expens (benefit)	2.7	36.1	(2.7)	28.9
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other, tax benefit	(181.5)	(453.4)	(121.7)	(543.0)
Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense (benefit)	$ 2.5	$ 3.0	$ 4.1	$ (5.5)