Deferred Acquisition Costs ("DAC"), Value Of Business Acquired ("VOBA") And Other Intangible Assets (Schedule Of Activity For DAC, VOBA And Other Intangible Assets) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Carrying value at beginning of period, DAC	$ 336.9	$ 319.1
Carrying value at beginning of period, VOBA	17.8	20.1
Carrying value at beginning of period, Other intangible assets	26.3	32.1
Total balance at beginning of period	381.0	371.3
Deferred or acquired, DAC	66.5	80.1
Total deferred or acquired	66.5	80.1
Amortized during period, DAC	(46.4)	(62.3)
Amortized during period, VOBA	(1.7)	(2.3)
Other intangible assets	(6.1)	(5.8)
Total amortized during period	(54.2)	(70.4)
Goodwill And Intangible Asset Impairment	(5.6)	0.0
Carrying value at end of period, net DAC	357.0	336.9
Carrying value at end of period, net VOBA	16.1	17.8
Carrying value at end of period, Other intangible assets	14.6	26.3
Total carrying value at end of period	$ 387.7	$ 381.0