CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 230.2	$ 202.0	$ 660.5	$ 653.2
Change in Net Unrealized Gain on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $303.1; $599.6; $496.5; $754.9)	596.8	1,124.5	965.0	1,419.0
Change in Net Unrealized Gain on Securities Other-Than-Temporarily Impaired (net of tax benefit of $-; $-; $-; $1.1)	0	0	0	(2.1)
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment (net of tax expense of $303.1; $599.6; $496.5; $753.8)	596.8	1,124.5	965.0	1,416.9
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $1.4; $3.4; $2.0; $4.6)	(2.6)	(5.3)	(4.0)	(7.7)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of ($6.0); $34.7; ($5.3); $32.0)	(10.3)	65.2	(8.4)	60.1
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $213.5; $377.6; $344.0; $498.8)	(430.1)	(703.3)	(683.6)	(931.2)
Change in Foreign Currency Translation Adjustment	29.4	(33.8)	39.0	(6.0)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $3.5; $2.8; $11.0; $6.9)	6.6	5.2	20.5	15.0
Total Other Comprehensive Income	189.8	452.5	328.5	547.1
Comprehensive Income	$ 420.0	$ 654.5	$ 989.0	$ 1,200.3