Segment Information (Reconciliation Of Operating Gain To Income From Reportable Segments To The Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Reportable segments operating gain	$ 4,001.4	$ 3,619.9	$ 3,782.1
Net investment income	659.1	686.1	703.7
Net realized gains on investments	271.9	334.9	235.1
Other-than-temporary impairment losses recognized in income	(98.9)	(37.8)	(93.3)
Interest expense	(602.7)	(511.8)	(430.3)
Amortization of other intangible assets	(245.3)	(233.0)	(239.4)
Loss on extinguishment of debt	(145.3)	0	0
Loss before income tax credits and equity in net income of subsidiaries	$ 3,840.2	$ 3,858.3	$ 3,957.9