Summary of significant accounting policies - Going Concern (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt		$ 1,413,800,000	$ 849,600,000
Cash and cash equivalents		642,600,000	576,100,000	$ 621,300,000
Forecast | Subsequent Event
Debt Instrument [Line Items]
Restructuring and related cost, number of positions eliminated, period percent	5.00%
Line of Credit
Debt Instrument [Line Items]
Long-term debt		598,000,000	0
Term Loan | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		$ 362,800,000	$ 396,600,000