CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue
Premium Income	$ 1,930.9	$ 1,921.9
Net Investment Income	621.1	619.5
Realized Investment Gain (Loss)
Total Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(0.8)	0
Other Net Realized Investment Gain	11.1	12.4
Net Realized Investment Gain (Loss)	10.3	12.4
Other Income	62.5	57.5
Total Revenue	2,624.8	2,611.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,648.5	1,662.9
Commissions	238.2	232.3
Interest and Debt Expense	37.1	35.5
Deferral of Acquisition Costs	(118.2)	(117.4)
Amortization of Deferred Acquisition Costs	123.8	99.4
Compensation Expense	197.6	206.9
Other Expenses	194.0	181.7
Total Benefits and Expenses	2,321.0	2,301.3
Income Before Income Tax	303.8	310.0
Income Tax (Benefit)
Current	81.8	37.3
Deferred	9.4	58.8
Total Income Tax	91.2	96.1
Net Income	$ 212.6	$ 213.9
Net Income Per Common Share
Basic	$ 0.79	$ 0.74
Diluted	$ 0.79	$ 0.73