CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income	$ 216.4	$ 227.6	$ 430.3	$ 451.2
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 $303.6; $196.0; $193.4; $155.3)	564.7	371.8	368.2	294.5
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 $303.6; $196.0; $193.4; $154.2)	564.7	371.8	368.2	292.4
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $0.3; $0.7; $0.6; $1.2)	(0.7)	(1.8)	(1.4)	(2.4)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $6.6; $2.7; $0.7; $(2.7))	12.6	4.8	1.9	(5.1)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $227.7; $181.0; $130.5; $121.2)	(420.3)	(341.1)	(253.5)	(227.9)
Change in Foreign Currency Translation Adjustment	(18.6)	1.3	9.6	27.8
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $4.0; $2.5; $7.5; $4.1)	7.4	4.7	13.9	9.8
Total Other Comprehensive Income	145.1	39.7	138.7	94.6
Comprehensive Income	$ 361.5	$ 267.3	$ 569.0	$ 545.8