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Shareholders' equity - Share Repurchase (Details) - USD ($) $ in Millions | Aug. 23, 2021 | Jul. 31, 2021
--- | --- | ---
Equity, Class of Treasury Stock [Line Items] |  |
Remaining authorized repurchase amount |  | $ 165.6
Subsequent Event |  |
Equity, Class of Treasury Stock [Line Items] |  |
Remaining authorized repurchase amount | $ 225.0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |