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Retired employees entitled to receive postretirement benefits.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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Pension, Health Care and Other Postretirement Benefits - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) pension_plan employee	Dec. 31, 2022 USD ($) employee	Dec. 31, 2021 USD ($) employee	Dec. 31, 2020 USD ($)
Minimum \| Equity Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	30.00%
Minimum \| Fixed Income Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	35.00%
Minimum \| Other Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	0.00%
Maximum \| Equity Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	65.00%
Maximum \| Fixed Income Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	70.00%
Maximum \| Other Securities
Expected defined benefit payments
Target allocation percentage of plan assets in equity securities	5.00%
Postretirement Health Coverage
Health care plans
Number of active employees entitled to receive benefits under health care plans \| employee	31,327	30,009	29,016
Cost of benefits includes claims incurred and claims incurred but not reported under health care plans	$ 363.2	$ 347.4	$ 336.0
Defined Benefit Pension
Health care plans
Fair value of plan assets	356.5	232.1	341.9
Expected defined benefit payments
Expected cash payments, 2024	17.7
Expected cash payments, 2025	17.5
Expected cash payments, 2026	18.7
Expected cash payments, 2027	20.0
Expected cash payments, 2028	21.2
Expected cash payments, 2029-2033	133.1
Amortization of actuarial gains	(1.4)
Amortization of prior service cost (credit)	1.8
Defined Benefit Pension \| Domestic Defined Benefit Pension Plan
Health care plans
Contributions by company	97.8	88.9	85.3
Projected benefit obligation	102.1	91.7	120.8	$ 118.6
Fair value of plan assets	135.1	119.4	155.2	144.3
Excess (deficient) plan assets over projected benefit obligations	33.0	27.7	34.4
Accumulated benefit obligation	$ 100.5	90.3	117.0
Defined Benefit Pension \| Domestic Defined Benefit Pension Plan \| Minimum
Health care plans
Contributions by company (percentage)	2.00%
Defined Benefit Pension \| Domestic Defined Benefit Pension Plan \| Maximum
Health care plans
Contributions by company (percentage)	7.00%
Defined Benefit Pension \| Foreign Defined Benefit Pension Plans
Health care plans
Contributions by company	$ 19.5	19.4	17.9
Projected benefit obligation	257.8	230.4	362.7	401.1
Fair value of plan assets	246.7	223.6	328.4	318.2
Excess (deficient) plan assets over projected benefit obligations	$ (11.1)	(6.8)	(34.3)
Number of defined benefit plans \| pension_plan	33
Accumulated benefit obligation	$ 236.4	209.3	334.8
Expected defined benefit payments
Estimated future employer contributions	6.1
Defined Benefit Pension \| Overfunded Plan \| Domestic Defined Benefit Pension Plan
Health care plans
Projected benefit obligation	102.1
Fair value of plan assets	135.1
Excess (deficient) plan assets over projected benefit obligations	33.0
Defined Benefit Pension \| Unfunded Plan \| Foreign Defined Benefit Pension Plans
Health care plans
Projected benefit obligation	89.4
Fair value of plan assets	20.4
Excess (deficient) plan assets over projected benefit obligations	$ (69.0)
Number of foreign defined benefit pension plans unfunded or underfunded \| pension_plan	26
Accumulated benefit obligation	$ 76.0
Postretirement Benefits Other than Pensions
Health care plans
Projected benefit obligation	147.2	$ 153.8	$ 276.4	$ 291.6
Expected defined benefit payments
Expected cash payments, 2024	14.0
Expected cash payments, 2025	14.9
Expected cash payments, 2026	14.8
Expected cash payments, 2027	14.4
Expected cash payments, 2028	13.7
Expected cash payments, 2029-2033	53.4
Amortization of actuarial gains	(0.3)
Amortization of prior service cost (credit)	$ (23.9)
Number of retired employees entitled to receive postretirement benefits \| employee	3,367	3,409	3,410
Defined benefit plan ultimate health care cost trend rate and prescription drug cost increase rate (percentage)	4.50%