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Accounts receivable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Receivables [Abstract] |  |  |
Revenue recognized in excess of billings on services contracts or unbilled accounts receivable | $ 95.3 | $ 93.9 |
Unearned income | 5.4 | 9.0 |
Allowance for doubtful accounts | 7.6 | 9.5 |
Provision for doubtful accounts reported in selling, general and administrative expenses, (income) expense | (1.2) | (0.2) | $ 0.3
Long-term receivables | $ 43.7 | $ 70.3 |

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