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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting [Abstract]
Reportable segments operating gain	$ 1,191.3	$ 1,001.0	$ 3,532.9	$ 3,582.0
Net investment income	174.4	167.6	546.6	482.8
Net realized gains on investments	25.7	95.4	133.2	166.4
Other-than-temporary impairment losses recognized in income	(13.8)	(26.2)	(35.5)	(73.1)
Interest expense	(155.3)	(151.5)	(447.1)	(456.9)
Amortization of other intangible assets	(60.3)	(61.3)	(168.3)	(185.6)
Loss on extinguishment of debt	(74.8)	(145.3)	(80.8)	(145.3)
Income from continuing operations before income tax expense	$ 1,087.2	$ 879.7	$ 3,481.0	$ 3,370.3