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Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	1 Months Ended
	Jan. 31, 2012	Mar. 31, 2012	Apr. 30, 2012 Repurchase of Equity [Member]
Class of Stock [Line Items]
Shares withheld for the payment of taxes		301,065
Stock repurchase authorization	$ 350
Stock repurchase program, share		2,146,347
Stock repurchase program, value		64.2
Stock repurchase program, payments settled			10.4
Common stock withheld under terms of share-based compensation agreements, value		$ 8.8

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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