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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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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