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, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Deferred Acquisition Costs, Value Of Business Acquired And Other Intangible Assets Disclosures [Abstract]
Carrying value at beginning of period, DAC	$ 274.4	$ 250.1
Carrying value at beginning of period, VOBA	26.4	28.4
Carrying value at beginning of period, Other intangible assets	44.1	51.7
Total balance at beginning of period	344.9	330.2
Deferred or acquired, DAC	55.3	81.7
Deferred or acquired, Other intangible assets	0	0
Total deferred or acquired	55.3	81.7
Amortized during period, DAC	(49.2)	(57.4)
Amortized during period, VOBA	(2.6)	(2.0)
Amortized during period, Other intangible assets	(4.4)	(7.6)
Total amortized during period	(56.2)	(67.0)
Carrying value at end of period, net DAC	280.5	274.4
Carrying value at end of period, net VOBA	23.8	26.4
Carrying value at end of period, Other intangible assets	39.7	44.1
Total carrying value at end of period	$ 344.0	$ 344.9