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Equity | 12 Months Ended
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Dec. 31, 2018
Equity |
Equity | 15. Equity A summary of shares repurchased under our securities repurchase program, and shares acquired, is as follows:
|  | Year Ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Shares repurchased (1) |  |  | 1,467,886 |  |  | 302,000 |  |  | 4,512,325 |
Aggregate purchase price |  | $ | 63.1 |  | $ | 12.7 |  | $ | 167.9 |
Average purchase price per share |  | $ | 43.00 |  | $ | 41.95 |  | $ | 37.21 |
Shares acquired (2) |  |  | 119,608 |  |  | 133,710 |  |  | 144,717 |
Aggregate purchase price |  | $ | 5.8 |  | $ | 5.8 |  | $ | 5.7 |
Average purchase price per share |  | $ | 48.61 |  | $ | 43.28 |  | $ | 39.47 |
| (1) |  | Shares were repurchased under our securities repurchase program. As of December 31, 2018, we had $136.9 million in repurchase authorization under the repurchase program. In February 2019, our Board of Directors increased the authority delegated to management to repurchase our outstanding securities to $200.0 million.
| (2) |  | Shares were acquired from employees in connection with a net share settlement feature of employee equity awards.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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