Defined contribution and defined benefit retirement plans- Schedule of Rollforward of Change in Fair Value of Level 3 Assets (Details) - Pension plans defined benefit - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Fair value at beginning of year	$ 462.9
Fair value at end of year	480.6	$ 462.9
Significant Unobservable Inputs (Level 3)
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Fair value at beginning of year	292.1	264.8
Gain on assets held at end of year	12.8	11.1
Gain (loss) on assets sold during the year	(0.7)	14.4
Assets purchased	1.5	1.7
Assets sold	(2.3)	(9.3)
Currency exchange rate fluctuations	(17.4)	9.4
Fair value at end of year	$ 286.0	$ 292.1

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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