Variable interest entities - Narrative (Details)	12 Months Ended
	Dec. 31, 2024
Equity share capital | Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	40.00%
Share of earnings and distributions | Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	55.00%
VIE (“Philippines Business”) | Equity share capital
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage, noncontrolling owner	60.00%
VIE (“Philippines Business”) | Share of earnings and distributions
Variable Interest Entity [Line Items]
Subsidiary, ownership percentage, noncontrolling owner	45.00%