CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net Income	$ 229.8	$ 209.7	$ 455.2	$ 439.5
Change in Net Unrealized Gains and Losses on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gains and Losses on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $196.0; $440.0; $155.3; $597.2)	371.8	823.1	294.5	1,129.1
Change in Net Unrealized Gains and Losses on Securities Other-Than-Temporarily Impaired (net of tax benefit of $0; $0.5; $1.1; $0.5)	0	(0.9)	(2.1)	(0.9)
Total Change in Net Unrealized Gains and Losses on Securities Before Reclassification Adjustment (net of tax expense of $196.0; $439.5; $154.2; $596.7)	371.8	822.2	292.4	1,128.2
Reclassification Adjustment for Net Realized Investment (Gain) Loss (net of tax expense (benefit) of $0.7; $(0.6); $1.2; $0.7)	(1.8)	0.4	(2.4)	(1.8)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $2.7; $36.1; $(2.7); $28.9)	4.8	67.9	(5.1)	53.9
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $181.5; $453.4; $121.7; $543.0)	(341.9)	(845.4)	(228.7)	(1,029.6)
Change in Foreign Currency Translation Adjustment	1.3	(15.7)	28.1	(78.0)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $2.5; $3.0; $4.1; $(5.5))	4.7	5.6	9.8	24.2
Total Other Comprehensive Income	38.9	35.0	94.1	96.9
Comprehensive Income	$ 268.7	$ 244.7	$ 549.3	$ 536.4