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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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