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Segment Information (Reconciliation Of Reportable Segment Operating Gain To Income From Continuing Operations Before Income Taxes In The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting [Abstract]      
Reportable segments operating gain $ 4,753.1 $ 4,418.4 $ 4,001.4
Net investment income 677.6 724.4 659.1
Net realized gains on investments 157.5 177.0 271.9
Other-than-temporary impairment losses recognized in income (83.4) (49.0) (98.9)
Interest expense (653.0) (600.7) (602.7)
Amortization of other intangible assets (230.1) (220.9) (245.3)
Gain (loss) on extinguishment of debt 9.3 (81.1) (145.3)
Income from continuing operations before income tax expense $ 4,631.0 $ 4,368.1 $ 3,840.2