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Equity (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended
Equity (Narrative) (Details) (USD $)	Jan. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Class of Stock [Line Items]
Shares withheld for the payment of taxes		305,037
Stock repurchase authorization	$ 350,000,000	$ 350,000,000
Stock repurchase program, share		6,351,498
Stock repurchase program, value		189,800,000
Share Purchased under Structed Share Repurchase Agreement		(100,000,000)	0
Parent [Member]
Class of Stock [Line Items]
Share Purchased under Structed Share Repurchase Agreement		$ (100,000,000)

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.

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- 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.

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