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Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) fund | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Pension Plans | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 1,383.1 | $ 1,817.9 | $ 2,440.1
Unfunded Commitments | 19.7 | 23.3 |
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 0.0 | 0.0 |
Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 0.0 | 0.0 |
Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | 0.0 |
Number of funds for which redemption has been requested | fund | 3 |  |
Pension Plans | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 19.7 | 23.3 |
Pension Plans | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 1,321.5 | 1,486.2 | $ 1,444.3
Unfunded Commitments | 43.4 | 42.1 |
Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 43.4 | 42.1 |
Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | $ 0.0 |
Redemption Notice Period Range | 10 days | 10 days |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 322.3 | $ 435.7 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 91.7 | 102.3 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 66.0 | 96.8 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 115.9 | 188.9 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 48.7 | 47.7 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 562.7 | 539.5 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 172.4 | 191.4 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 390.3 | 348.1 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value |  | 0.0 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value |  | $ 0.0 |
Minimum | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 15 days | 15 days |
Minimum | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range |  | 5 days |
Minimum | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 60 days | 60 days |
Requested redemption, estimated period for full receipt | 3 years |  |
Maximum |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 120 days |  |
Maximum | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 45 days | 45 days |
Maximum | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 days |
Maximum | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 days |
Requested redemption, estimated period for full receipt | 5 years |  |

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