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Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Share repurchase program |
Cumulative shares that have been repurchased in stock repurchase program | 26.3
Cumulative value of shares repurchased in stock repurchase program | $ 428.9
Remaining shares authorized to be repurchased | 5.2

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- Definition The cumulative number of shares that have been repurchased since the commencement of the stock repurchase agreement. + References No definition available. + Details
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- Definition The cumulative value of shares that have been repurchased since the commencement of the stock repurchase agreement. + References No definition available. + Details
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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. + References No definition available. + Details
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