CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 210.6	$ 212.9
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense of $414.3; $182.8)	800.1	350.2
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax benefit of $287.7; $120.3)	(566.0)	(226.2)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(13.6); $9.0)	(26.2)	20.9
Change in Foreign Currency Translation Adjustment (net of tax benefit of $0.0; $0.1)	(26.4)	(54.0)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.6; $1.5)	3.1	3.1
Total Other Comprehensive Income	184.6	94.0
Comprehensive Income	$ 395.2	$ 306.9