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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 |

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