Securities Available For Sale Securities Available For Sale (Schedule Of Auction Rate Securities Sold) (Details) (Auction Rate Securities [Member], USD $) In Millions, unless otherwise specified					15 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010 Collateralized Debt Obligations Sold [Member]
Schedule of Available-for-sale Securities [Line Items]
Par value	$ 17.9		$ 17.9		$ 11.2
Adjusted cost basis	14.6	[1]	14.6	[1]	6.6
Auction rate securities, fair value	14.4	[2]	13.6	[2]	5.7
Cumulative realized losses					4.2
Accumulated losses on other comprehensive income, net of tax					$ 0.6

[1] Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both December 31, 2012 and 2011 totaled $3.3 million. Par value of securities held as of both December 31, 2012 and 2011 totaled $17.9 million.

[2] The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.