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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 36.0
Participant contributions 0.6 0.5  
Plan amendments 0.0 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 0.0 (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 0.0 (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 8.0  
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 4.0 (2.0)  
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 (0.5)  
Reclassification adjustment for amortization of prior service cost included in net income (loss) 0.1 0.0  
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 14.0
Plan amendments 8.8 0.0  
Benefits paid (29.0) (27.8)  
Actuarial (gains) losses (46.8) (7.9)  
Foreign currency exchange effects (2.6) 1.2  
Benefit obligation at end of year 250.0 305.3 323.1
Changes in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 136.1 139.0  
Return on assets – actual 13.6 14.2  
Plan combinations 0.5 2.7  
Employer contributions 8.3 8.0  
Benefits paid (29.0) (27.8)  
Fair value of plan assets at end of year 129.5 136.1 139.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Funded status (120.5) (169.2)  
Current liability, included in accrued liabilities 9.0 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) 6.0 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 81.0  
Prior service credit (cost) from plan amendments during the year (8.8) 0.0  
Reclassification adjustment for amortization of prior service cost included in net income (loss) (9.4) (11.1)  
Foreign currency exchange effects 0.0 0.0  
End of year - net prior service (cost) credit 51.7 69.9 81.0
U.S. Plans      
Changes in the benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 629.2 627.2  
Service cost 0.0 0.0 0.0
Interest cost 30.7 32.4 22.9
Participant contributions 0.0 0.0  
Plan amendments 0.0 0.0  
Plan combinations 0.0 0.0  
Curtailment 0.0 0.0  
Settlements 0.0 0.0  
Benefits paid (45.0) (45.2)  
Divestitures 0.0 0.0  
Actuarial (gains) losses (29.2) 14.8  
Foreign currency exchange effects 0.0 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 0.0  
Plan combinations 0.0 0.0  
Employer contributions 0.7 0.6  
Settlements 0.0 0.0  
Benefits paid (45.0) (45.2)  
Divestitures 0.0 0.0  
Foreign currency exchange effects 0.0 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 2.0 (17.6)  
Noncurrent asset 8.2 0.0  
Current liability, included in accrued liabilities 0.6 0.7  
Noncurrent liability 5.6 16.9  
Net pension (asset) liability (2.0) 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 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 0.0  
Prior service credit (cost) from plan amendments during the year 0.0 0.0  
Reclassification adjustment for amortization of prior service cost included in net income (loss) 0.0 0.0  
Foreign currency exchange effects 0.0 0.0  
End of year - net prior service (cost) credit 0.0 0.0 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 27.0 18.0  
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 2.0    
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 (26.0) 13.0  
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 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 0.0 (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 0.0 (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 2.0 (24.0)  
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss) 3.7 1.8  
Foreign currency exchange effects 4.0 (2.0)  
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 (0.5)  
Reclassification adjustment for amortization of prior service cost included in net income (loss) 0.1 0.0  
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 11.0 (30.0)  
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 (9.0) 10.0  
UMWA Plans      
Changes in the benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 214.0 233.9  
Service cost 0.0 0.0 0.0
Interest cost 9.6 11.1 10.3
Plan amendments 8.8 0.0  
Benefits paid (20.7) (19.8)  
Actuarial (gains) losses (39.5) (11.2)  
Foreign currency exchange effects 0.0 0.0  
Benefit obligation at end of year 172.2 214.0 233.9
Changes in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 136.1 139.0  
Return on assets – actual 13.6 14.2  
Plan combinations 0.5 2.7  
Employer contributions 0.0 0.0  
Benefits paid (20.7) (19.8)  
Fair value of plan assets at end of year 129.5 136.1 139.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Funded status (42.7) (77.9)  
Current liability, included in accrued liabilities 0.0 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 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) 0.0 66.7
Reclassification adjustment for amortization of prior service cost included in net income (loss) (9.4) (11.0)  
Foreign currency exchange effects 0.0 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 7.0 5.0  
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 3.0 4.0  
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 35.0 17.0  
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 (4.0)    
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 0.0  
Benefits paid (8.3) (8.0)  
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 0.0  
Return on assets – actual 0.0 0.0  
Plan combinations 0.0 0.0  
Employer contributions 8.3 8.0  
Benefits paid (8.3) (8.0)  
Fair value of plan assets at end of year 0.0 0.0 0.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Funded status (77.8) (91.3)  
Current liability, included in accrued liabilities 9.0 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 0.0  
Reclassification adjustment for amortization of prior service cost included in net income (loss) 0.0 (0.1)  
Foreign currency exchange effects 0.0 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 4.0 $ 2.0  
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 (4.0)    
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 $ 7.0