Commitment and contingencies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Letter of credit
Other Commitments [Line Items]
Debt instrument, term	1 year	1 year	1 year
Financial guarantee
Other Commitments [Line Items]
Guarantor obligations, current carrying value	$ 12,400.0	$ 9,500.0	$ 11,300.0
Financial standby letter of credit
Other Commitments [Line Items]
Guarantor obligations, current carrying value	$ 400.0	$ 400.0	$ 400.0