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Supplemental financial information - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 27, 2021 | Sep. 30, 2021 | Sep. 30, 2021
Asset Acquisition [Line Items] |  |  |
Treasury shares issued related to stock compensation (in shares) |  | 1,064,600 | 6,163,997
Subsequent Event |  |  |
Asset Acquisition [Line Items] |  |  |
Cash consideration for acquisition | $ 900 |  |

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