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Stockholders' equity (Details) - USD ($) shares in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |
Authorized amount |  |  | $ 300,000,000
Remaining authorized repurchase amount |  | $ 264,400,000 |
Chief Executive Officer (CEO) [Member] | Common Class B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares contributed to company without consideration | 5.2 |  |

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