Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions	$ 9.6
Discount percent	50.00%
Defined contribution plan maximum annual contribution per employee percent	2.00%
Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments	$ 4.0
Structured credit
Defined Benefit Plan Disclosure [Line Items]
Required notice	65 days
Hedge funds of plans
Defined Benefit Plan Disclosure [Line Items]
Required notice	105 days
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 629.2	$ 627.2
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	346.6	$ 304.2
Estimated contributions	9.7
Nonqualified U.S. pension plan
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions	$ 0.6
UMWA Plans
Defined Benefit Plan Disclosure [Line Items]
Black lung health care cost trend rate	6.80%	7.00%
Black lung health care cost ultimate rate	5.00%	5.00%
UMWA Plans \| Energy debt
Defined Benefit Plan Disclosure [Line Items]
Lockup provision	3 years
Black Lung and Other Plans
Defined Benefit Plan Disclosure [Line Items]
Black lung health care cost ultimate rate	5.00%	5.00%
Canada Plan
Defined Benefit Plan Disclosure [Line Items]
Black lung health care cost trend rate	6.80%	7.00%
Black lung health care cost ultimate rate	5.00%	5.00%
Brazil Plan
Defined Benefit Plan Disclosure [Line Items]
Black lung health care cost trend rate	4.80%	4.80%

Defined Benefit Plan, Plan Assets, Investment Lockup Provision

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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