CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 203.8	$ 219.1	$ 641.0	$ 684.3
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(89.6); $(91.9); $(561.7); $583.9)	(168.5)	(152.2)	(1,085.4)	1,130.5
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $113.9; $67.2; $500.8; $(416.5))	215.0	113.0	953.7	(804.2)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $4.7; $5.4; $7.5; $(5.4))	13.4	14.0	14.1	(12.8)
Change in Foreign Currency Translation Adjustment (net of tax benefit of $-; $-; $0.1; $-)	(44.1)	(60.2)	(33.2)	(22.4)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.4; $0.9; $3.3; $1.2)	2.8	2.1	6.4	2.5
Total Other Comprehensive Income (Loss)	18.6	(83.3)	(144.4)	293.6
Comprehensive Income	$ 222.4	$ 135.8	$ 496.6	$ 977.9