Segment Information (Reconciliation Of Reportable Segments Operating Gain To Income Before Income Tax Expense Included In The Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]
Reportable segments operating gain	$ 1,118.7	$ 1,357.3
Net investment income	183.7	162.0
Net realized gains on investments	41.7	16.8
Other-than-temporary impairment losses recognized in income	(10.8)	(37.9)
Interest expense	(146.2)	(153.5)
Amortization of other intangible assets	(54.0)	(62.2)
Loss on extinguishment of debt	(3.0)	0
Income from continuing operations before income tax expense	$ 1,130.1	$ 1,282.5