CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 228.9	$ 212.6
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $371.1; $(159.4)	710.0	(278.5)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $(272.0); $108.6	(520.4)	197.4
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $1.0; $(0.2)	1.7	(2.0)
Change in Foreign Currency Translation Adjustment	7.6	(69.9)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $0.3; $5.5)	0.5	10.7
Total Other Comprehensive Income (Loss)	199.4	(142.3)
Comprehensive Income	$ 428.3	$ 70.3