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Stockholders' Equity and Contingently Redeemable Common Stock (Details 2) (USD $) In Millions | Jun. 30, 2011
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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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- Details
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Balance Type: | na
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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. + Details
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Period Type: | instant

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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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