CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue
Premium Income	$ 8,357.7	$ 8,082.4	$ 7,797.2
Net Investment Income	2,459.0	2,481.2	2,492.2
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(30.5)	(32.4)	(13.5)
Other Net Realized Investment Gain (Loss)	54.7	(11.4)	29.6
Net Realized Investment Gain (Loss)	24.2	(43.8)	16.1
Other Income	205.6	211.5	219.0
Total Revenue	11,046.5	10,731.3	10,524.5
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	6,941.8	6,782.8	7,310.8
Commissions	1,026.7	996.3	935.3
Interest and Debt Expense	166.0	152.8	167.5
Deferral of Acquisition Costs	(592.4)	(569.7)	(524.0)
Amortization of Deferred Acquisition Costs	493.0	482.3	440.8
Compensation Expense	832.1	835.1	820.9
Other Expenses	831.6	813.4	831.2
Total Benefits and Expenses	9,698.8	9,493.0	9,982.5
Income Before Income Tax	1,347.7	1,238.3	542.0
Income Tax
Current	385.7	342.1	135.5
Deferred	30.6	29.1	4.4
Total Income Tax	416.3	371.2	139.9
Net Income	$ 931.4	$ 867.1	$ 402.1
Net Income Per Common Share
Basic	$ 3.96	$ 3.51	$ 1.57
Assuming Dilution	$ 3.95	$ 3.50	$ 1.57