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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2015
Common Stock. |
Summary of shares repurchased |
|  | Years Ended December 31, |
|  | 2015 |  | 2014 |
|  | Number of shares repurchased |  | Cost of shares repurchased |  | Number of shares repurchased |  | Cost of shares repurchased |
|  | (amounts in millions, except share amount) |
Stock repurchase programs: |  |  |  |  |  |  |  |  |  |  |  |  |
April 30, 2013 |  |  | 497,010 |  | $ | 27.3 |  |  | 669,681 |  | $ | 39.6 |
July 27, 2015 |  |  | 315,530 |  |  | 17.3 |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  |  | 812,540 |  | $ | 44.6 |  |  | 669,681 |  | $ | 39.6 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of an entity's number of shares repurchased and cost of repurchase during the period. + References No definition available. + Details
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