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Stockholders' Equity and Contingently Redeemable Common Stock (Details 2) (USD $) In Millions	Sep. 30, 2011
Share repurchase program
Cumulative shares that have been repurchased in stock repurchase program (in shares)	26.3
Cumulative value of shares that have been repurchased in stock repurchase program	$ 428.9
Remaining shares authorized to be repurchased (in shares)	5.2

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- Definition

The cumulative number of shares that have been repurchased since the commencement of the stock repurchase agreement.

+ Details

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- Definition

The cumulative value of shares that have been repurchased since the commencement of the stock repurchase agreement.

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ Details

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