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Shareholders' Equity (Schedule Of Repurchase Of Shares) (Parenthetical) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012 Rule 10b5-1 [Member]	Dec. 31, 2011 Rule 10b5-1 [Member]	Sep. 30, 2012 12/14/2011 [Member]	Jun. 30, 2012 12/14/2011 [Member] Rule 10b5-1 [Member]
Shares Repurchased [Line Items]
Number of Shares Repurchased			73,018	184,311
Total Cost		$ 7.5	$ 2.1	$ 5.4
Number of Shares Repurchased	215,582	257,329
Total Average Price of Shares Repurchased					$ 29.06
Average Price of Shares Repurchased	$ 30.28			$ 29.13
Total Cost	$ 6.5

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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