CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 236.8	$ 224.3	$ 447.4	$ 437.2
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $479.9; $(654.9); $894.2; $(472.1))	921.9	(1,267.1)	1,722.0	(916.9)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $(367.6); $507.2; $(655.3); $386.9)	(699.2)	964.9	(1,265.2)	738.7
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(4.4); $(6.2); $(18.0); $2.8)	(8.2)	(20.2)	(34.4)	0.7
Change in Foreign Currency Translation Adjustment (net of tax benefit of $-; $-; $-; $0.1)	(79.4)	64.9	(105.8)	10.9
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $2.0; $0.4; $3.6; $1.9)	4.0	0.5	7.1	3.6
Total Other Comprehensive Income (Loss)	139.1	(257.0)	323.7	(163.0)
Comprehensive Income (Loss)	$ 375.9	$ (32.7)	$ 771.1	$ 274.2