Retirement Benefits - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended |
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Noncurrent asset | $ 20.9 | $ 15.1 | |
Total | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 1,012.3 | 961.9 | |
Service cost | 8.7 | 7.6 | $ 8.1 |
Interest cost | 48.4 | 50.5 | 36 |
Participant contributions | 0.6 | 0.5 | |
Plan amendments | 0 | 0.5 | |
Plan combinations | 2.2 | 0.4 | |
Curtailment | 0.1 | (0.1) | |
Settlements | (0.9) | (3.8) | |
Benefits paid | (67.4) | (66.6) | |
Divestitures | 0 | (3.7) | |
Actuarial (gains) losses | (39.8) | 48.7 | |
Foreign currency exchange effects | (30.7) | 16.4 | |
Benefit obligation at end of year | 933.5 | 1,012.3 | 961.9 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 870.9 | 841.8 | |
Return on assets – actual | 23.3 | 80.8 | |
Participant contributions | 0.6 | 0.5 | |
Plan combinations | 2.2 | 0.4 | |
Employer contributions | 14.4 | 13.4 | |
Settlements | (0.9) | (3.8) | |
Benefits paid | (67.4) | (66.6) | |
Divestitures | 0 | (3.7) | |
Foreign currency exchange effects | (16.9) | 8.1 | |
Fair value of plan assets at end of year | 826.2 | 870.9 | 841.8 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (107.3) | (141.4) | |
Noncurrent asset | 20.9 | 15.1 | |
Current liability, included in accrued liabilities | 5.7 | 8 | |
Noncurrent liability | 122.5 | 148.5 | |
Net pension (asset) liability | 107.3 | 141.4 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (230.3) | (205.6) | |
Net actuarial gains (losses) arising during the year | 5.2 | (26.1) | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 8.9 | 3.4 | |
Foreign currency exchange effects | 4 | (2) | |
End of year - net gains and losses | (212.2) | (230.3) | (205.6) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | (0.7) | (0.1) | |
Prior service credit (cost) from plan amendments during the year | 0 | (0.5) | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | 0.1 | 0 | |
Foreign currency exchange effects | 0.1 | (0.1) | |
End of year - net prior service (cost) credit | (0.5) | (0.7) | (0.1) |
Retirement benefits other than pension | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 305.3 | 323.1 | |
Service cost | 0.1 | 0.3 | 0.1 |
Interest cost | 14.2 | 16.4 | 14 |
Plan amendments | 8.8 | 0 | |
Benefits paid | (29) | (27.8) | |
Actuarial (gains) losses | (46.8) | (7.9) | |
Foreign currency exchange effects | (2.6) | 1.2 | |
Benefit obligation at end of year | 250 | 305.3 | 323.1 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 136.1 | 139 | |
Return on assets – actual | 13.6 | 14.2 | |
Plan combinations | 0.5 | 2.7 | |
Employer contributions | 8.3 | 8 | |
Benefits paid | (29) | (27.8) | |
Fair value of plan assets at end of year | 129.5 | 136.1 | 139 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (120.5) | (169.2) | |
Current liability, included in accrued liabilities | 9 | 9.6 | |
Noncurrent liability | 111.5 | 159.6 | |
Net pension (asset) liability | 120.5 | 169.2 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (118.1) | (139.4) | |
Net actuarial gains (losses) arising during the year | 50.2 | 11.8 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 6 | 9.9 | |
Foreign currency exchange effects | 0.2 | (0.4) | |
End of year - net gains and losses | (61.7) | (118.1) | (139.4) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 69.9 | 81 | |
Prior service credit (cost) from plan amendments during the year | (8.8) | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | (9.4) | (11.1) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 51.7 | 69.9 | 81 |
U.S. Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 629.2 | 627.2 | |
Service cost | 0 | 0 | 0 |
Interest cost | 30.7 | 32.4 | 22.9 |
Participant contributions | 0 | 0 | |
Plan amendments | 0 | 0 | |
Plan combinations | 0 | 0 | |
Curtailment | 0 | 0 | |
Settlements | 0 | 0 | |
Benefits paid | (45) | (45.2) | |
Divestitures | 0 | 0 | |
Actuarial (gains) losses | (29.2) | 14.8 | |
Foreign currency exchange effects | 0 | 0 | |
Benefit obligation at end of year | 585.7 | 629.2 | 627.2 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 611.6 | 596.3 | |
Return on assets – actual | 20.4 | 59.9 | |
Participant contributions | 0 | 0 | |
Plan combinations | 0 | 0 | |
Employer contributions | 0.7 | 0.6 | |
Settlements | 0 | 0 | |
Benefits paid | (45) | (45.2) | |
Divestitures | 0 | 0 | |
Foreign currency exchange effects | 0 | 0 | |
Fair value of plan assets at end of year | 587.7 | 611.6 | 596.3 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | 2 | (17.6) | |
Noncurrent asset | 8.2 | 0 | |
Current liability, included in accrued liabilities | 0.6 | 0.7 | |
Noncurrent liability | 5.6 | 16.9 | |
Net pension (asset) liability | (2) | 17.6 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (187.2) | (186.7) | |
Net actuarial gains (losses) arising during the year | 3.2 | (2.1) | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 5.2 | 1.6 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net gains and losses | (178.8) | (187.2) | (186.7) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0 | 0 | |
Prior service credit (cost) from plan amendments during the year | 0 | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | 0 | 0 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 0 | 0 | 0 |
U.S. Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 27 | 18 | |
U.S. Plans | Actuarial Gains (Losses) - Change in Census Data | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 2 | | |
U.S. Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | (26) | 13 | |
Non-U.S. Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 383.1 | 334.7 | |
Service cost | 8.7 | 7.6 | 8.1 |
Interest cost | 17.7 | 18.1 | 13.1 |
Participant contributions | 0.6 | 0.5 | |
Plan amendments | 0 | 0.5 | |
Plan combinations | 2.2 | 0.4 | |
Curtailment | 0.1 | (0.1) | |
Settlements | (0.9) | (3.8) | |
Benefits paid | (22.4) | (21.4) | |
Divestitures | 0 | (3.7) | |
Actuarial (gains) losses | (10.6) | 33.9 | |
Foreign currency exchange effects | (30.7) | 16.4 | |
Benefit obligation at end of year | 347.8 | 383.1 | 334.7 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 259.3 | 245.5 | |
Return on assets – actual | 2.9 | 20.9 | |
Participant contributions | 0.6 | 0.5 | |
Plan combinations | 2.2 | 0.4 | |
Employer contributions | 13.7 | 12.8 | |
Settlements | (0.9) | (3.8) | |
Benefits paid | (22.4) | (21.4) | |
Divestitures | 0 | (3.7) | |
Foreign currency exchange effects | (16.9) | 8.1 | |
Fair value of plan assets at end of year | 238.5 | 259.3 | 245.5 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (109.3) | (123.8) | |
Noncurrent asset | 12.7 | 15.1 | |
Current liability, included in accrued liabilities | 5.1 | 7.3 | |
Noncurrent liability | 116.9 | 131.6 | |
Net pension (asset) liability | 109.3 | 123.8 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (43.1) | (18.9) | |
Net actuarial gains (losses) arising during the year | 2 | (24) | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 3.7 | 1.8 | |
Foreign currency exchange effects | 4 | (2) | |
End of year - net gains and losses | (33.4) | (43.1) | (18.9) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | (0.7) | (0.1) | |
Prior service credit (cost) from plan amendments during the year | 0 | (0.5) | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | 0.1 | 0 | |
Foreign currency exchange effects | 0.1 | (0.1) | |
End of year - net prior service (cost) credit | (0.5) | (0.7) | (0.1) |
Non-U.S. Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 11 | (30) | |
Non-U.S. Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | (9) | 10 | |
UMWA Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 214 | 233.9 | |
Service cost | 0 | 0 | 0 |
Interest cost | 9.6 | 11.1 | 10.3 |
Plan amendments | 8.8 | 0 | |
Benefits paid | (20.7) | (19.8) | |
Actuarial (gains) losses | (39.5) | (11.2) | |
Foreign currency exchange effects | 0 | 0 | |
Benefit obligation at end of year | 172.2 | 214 | 233.9 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 136.1 | 139 | |
Return on assets – actual | 13.6 | 14.2 | |
Plan combinations | 0.5 | 2.7 | |
Employer contributions | 0 | 0 | |
Benefits paid | (20.7) | (19.8) | |
Fair value of plan assets at end of year | 129.5 | 136.1 | 139 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (42.7) | (77.9) | |
Current liability, included in accrued liabilities | 0 | 0 | |
Noncurrent liability | 42.7 | 77.9 | |
Net pension (asset) liability | 42.7 | 77.9 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (73.7) | (93.9) | |
Net actuarial gains (losses) arising during the year | 42.9 | 15.1 | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 1.7 | 5.1 | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net gains and losses | (29.1) | (73.7) | (93.9) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 69.7 | 80.7 | |
Prior service credit (cost) from plan amendments during the year | (8.8) | 0 | 66.7 |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | (9.4) | (11) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 51.5 | 69.7 | 80.7 |
UMWA Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 7 | 5 | |
UMWA Plans | Actuarial Gains (Losses) - Asset Return Different from Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 3 | 4 | |
UMWA Plans | Actuarial Gains (Losses) - Claims Assumptions Updates | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 35 | 17 | |
UMWA Plans | Actuarial Gains (Losses) - Payments Higher Than Expected | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | (4) | | |
Black Lung and Other Plans | | | |
Changes in the benefit obligation [Roll Forward] | | | |
Benefit obligation at beginning of year | 91.3 | 89.2 | |
Service cost | 0.1 | 0.3 | 0.1 |
Interest cost | 4.6 | 5.3 | 3.7 |
Plan amendments | 0 | 0 | |
Benefits paid | (8.3) | (8) | |
Actuarial (gains) losses | (7.3) | 3.3 | |
Foreign currency exchange effects | (2.6) | 1.2 | |
Benefit obligation at end of year | 77.8 | 91.3 | 89.2 |
Changes in plan assets [Roll Forward] | | | |
Fair value of plan assets at beginning of year | 0 | 0 | |
Return on assets – actual | 0 | 0 | |
Plan combinations | 0 | 0 | |
Employer contributions | 8.3 | 8 | |
Benefits paid | (8.3) | (8) | |
Fair value of plan assets at end of year | 0 | 0 | 0 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] | | | |
Funded status | (77.8) | (91.3) | |
Current liability, included in accrued liabilities | 9 | 9.6 | |
Noncurrent liability | 68.8 | 81.7 | |
Net pension (asset) liability | 77.8 | 91.3 | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net gains and losses | (44.4) | (45.5) | |
Net actuarial gains (losses) arising during the year | 7.3 | (3.3) | |
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) | 4.3 | 4.8 | |
Foreign currency exchange effects | 0.2 | (0.4) | |
End of year - net gains and losses | (32.6) | (44.4) | (45.5) |
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss): | | | |
Beginning of year - net prior service (cost) credit | 0.2 | 0.3 | |
Prior service credit (cost) from plan amendments during the year | 0 | 0 | |
Reclassification adjustment for amortization of prior service cost included in net income (loss) | 0 | (0.1) | |
Foreign currency exchange effects | 0 | 0 | |
End of year - net prior service (cost) credit | 0.2 | 0.2 | $ 0.3 |
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Discount Rate | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | 4 | $ 2 | |
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Census Data | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | (4) | | |
Black Lung and Other Plans | Actuarial Gains (Losses) - Claims Assumptions Updates | | | |
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss): | | | |
Net actuarial gains (losses) arising during the year | $ 7 | | |