Deferred Acquisition Costs ("DAC"), Value Of Business Acquired ("VOBA") And Other Intangible Assets (Amount For DAC, VOBA Balances And Percentage To The Expected Gross Profit) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Deferred Acquisition Costs, Value Of Business Acquired And Other Intangible Assets Disclosures [Abstract]
DAC	$ 57.1	$ 60.7
VOBA	$ 6.0	$ 7.1
DAC, percent	20.40%	22.10%
VOBA, percent	25.20%	26.90%