CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue
Premium Income	$ 1,921.9	$ 1,869.5
Net Investment Income	619.5	618.7
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	0	(2.3)
Other Net Realized Investment Gain	12.4	17.5
Net Realized Investment Gain	12.4	15.2
Other Income	57.5	59.7
Total Revenue	2,611.3	2,563.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,662.9	1,593.0
Commissions	232.3	224.3
Interest and Debt Expense	35.5	37.9
Deferral of Acquisition Costs	(117.4)	(112.2)
Amortization of Deferred Acquisition Costs	99.4	95.0
Compensation Expense	206.9	201.9
Other Expenses	181.7	195.8
Total Benefits and Expenses	2,301.3	2,235.7
Income Before Income Tax	310.0	327.4
Income Tax
Current	37.3	65.3
Deferred	58.8	38.5
Total Income Tax	96.1	103.8
Net Income	$ 213.9	$ 223.6
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.74	$ 0.72
Earnings Per Share, Assuming Dilution	$ 0.73	$ 0.71