XML 94 R69.htm IDEA: XBRL DOCUMENT

Capital Stock - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended
Capital Stock - Additional Information (Detail) (USD $)	Oct. 31, 2006	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share Repurchase Program	$ 1,000,000,000
Repurchase of shares of common stock		0.0	3.3	0.0
Aggregate cost of repurchase			73,600,000
Aggregate number of shares repurchased			6.8
Shares repurchased aggregate value			504,300,000
Number of shares repurchased under settlement of employee tax withholding obligations			0.1	0.1
Shares repurchased aggregate value under settlement of employee tax withholding obligations			$ 3,300,000	$ 5,400,000

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.

+ References+ Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

+ References+ Details