CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 224.3	$ 239.4	$ 437.2	$ 465.2
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(654.9); $304.7; $(472.1); $675.8)	(1,267.1)	572.7	(916.9)	1,282.7
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $507.2; $(211.7); $386.9; $(483.7))	964.9	(396.8)	738.7	(917.2)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(6.2) $(11.8); $2.8; $(10.8))	(20.2)	(28.5)	0.7	(26.8)
Change in Foreign Currency Translation Adjustment (net of tax benefit of $-; $-; $0.1; $-)	64.9	30.2	10.9	37.8
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $0.4; $-; $1.9; $0.3)	0.5	(0.1)	3.6	0.4
Total Other Comprehensive Income (Loss)	(257.0)	177.5	(163.0)	376.9
Comprehensive Income (Loss)	$ (32.7)	$ 416.9	$ 274.2	$ 842.1