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Retirement plans - Narrative (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
TRP |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total net pension obligations | $ 59,100,000 |
Cash contributions | 0 | $ 0
TRP | Accrued liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total net pension obligations | 6,000,000 |
SERP |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash contributions | 2,900,000 | $ 5,300,000
Additional cash payments | $ 2,500,000 |

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