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Supplementary Data Share Repurchase Program (Notes) | 6 Months Ended
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Jun. 30, 2015
Stockholders' Equity Note [Abstract] |
Share Repurchase Program | Share Repurchase Program In February 2015, our Board of Directors (the "Board") authorized a new share repurchase program to repurchase from time to time up to $300.0, excluding fees, of our common stock, which was in addition to the remaining amount available to be repurchased from the $300.0 authorization made by the Board in February 2014. We may effect such repurchases through open market purchases, trading plans established in accordance with SEC rules, derivative transactions or other means. We expect to continue to repurchase our common stock in future periods, although the timing and amount of the repurchases will depend on market conditions and other funding requirements. The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2015 and 2014.
| Six months ended June 30,
| 2015 |  | 2014
Number of shares repurchased | 4.9 |  |  | 5.6 |
Aggregate cost, including fees | $ | 102.0 |  |  | $ | 97.3 |
Average price per share, including fees | $ | 20.87 |  |  | $ | 17.51 |
As of June 30, 2015, $341.6 remains available for repurchase under the share repurchase programs. The share repurchase programs have no expiration date.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References No definition available. + Details
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