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Supplementary Data Share Repurchase Program (Tables) | 12 Months Ended
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Dec. 31, 2017
Share Repurchase Program [Abstract] |
Share Repurchase Program [Table Text Block] | The following table presents our share repurchase activity under our share repurchase programs.
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Number of shares repurchased | 13.7 |  |  | 13.3 |  |  | 13.6 |
Aggregate cost, including fees | $ | 300.1 |  |  | $ | 303.3 |  |  | $ | 285.2 |
Average price per share, including fees | $ | 21.97 |  |  | $ | 22.76 |  |  | $ | 20.97 |

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- Definition Share repurchase program to repurchase common stock through open market purchases, trading plans established in accordance with SEC rules, derivative transaction or other means. The repurchase program has no expiration date. + References No definition available. + Details
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- Definition [Table Text Block] for Share Repurchase Program [Table] + References No definition available. + Details
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