Retirement Benefits - Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Noncurrent asset	$ 17.7	$ 18.4
Total
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	1,331.7	1,427.8
Service cost	8.1	9.1	$ 9.7
Interest cost	36.0	33.2	38.3
Participant contributions	0.3	0.4
Plan amendments	0.1	(0.7)
Plan combinations	0.9	7.6
Acquisitions	0.0	5.9
Curtailment	(0.4)	(1.1)
Settlements	(10.8)	(14.0)
Benefits paid	(61.1)	(60.7)
Actuarial gains	(317.5)	(59.6)
Foreign currency exchange effects	(25.4)	(16.2)
Benefit obligation at end of year	961.9	1,331.7	1,427.8
Changes in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	1,125.1	1,102.9
Return on assets – actual	(205.2)	86.7
Participant contributions	0.3	0.4
Plan combinations	0.9	5.0
Employer contributions	15.3	13.2
Settlements	(10.8)	(14.0)
Benefits paid	(61.1)	(60.7)
Foreign currency exchange effects	(22.7)	(8.4)
Fair value of plan assets at end of year	841.8	1,125.1	1,102.9
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(120.1)	(206.6)
Noncurrent asset	17.7	18.4
Current liability, included in accrued liabilities	6.8	5.7
Noncurrent liability	131.0	219.3
Net pension liability	120.1	206.6
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(289.6)	(403.9)
Net actuarial gains arising during the year	50.9	69.7
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	29.4	43.9
Foreign currency exchange effects	3.7	0.7
End of year - net gains and losses	(205.6)	(289.6)	(403.9)
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss):
Beginning of year - net prior service (cost) credit	0.1	(0.6)
Prior service credit (cost) from plan amendments during the year	(0.1)	0.7
Foreign currency exchange effects	(0.1)	0.0
End of year - net prior service (cost) credit	(0.1)	0.1	(0.6)
Retirement benefits other than pension
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	510.4	558.0
Service cost	0.1	0.1	0.1
Interest cost	14.0	13.0	16.5
Plan amendments	(66.7)	0.0
Benefits paid	(29.3)	(31.0)
Actuarial gains	(105.7)	(29.0)
Foreign currency exchange effects	0.3	(0.7)
Benefit obligation at end of year	323.1	510.4	558.0
Changes in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	178.0	168.0
Return on assets – actual	(15.1)	32.9
Plan combinations	(3.6)	0.0
Employer contributions	9.0	8.1
Benefits paid	(29.3)	(31.0)
Fair value of plan assets at end of year	139.0	178.0	168.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(184.1)	(332.4)
Current liability, included in accrued liabilities	9.6	10.2
Noncurrent liability	174.5	322.2
Net pension liability	184.1	332.4
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(234.0)	(310.4)
Net actuarial gains arising during the year	77.4	49.6
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	17.3	26.5
Foreign currency exchange effects	(0.1)	0.3
End of year - net gains and losses	(139.4)	(234.0)	(310.4)
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss):
Beginning of year - net prior service (cost) credit	19.2	24.2
Prior service credit (cost) from plan amendments during the year	66.7	0.0
Reclassification adjustment for amortization of prior service cost included in net income (loss)	(4.9)	(5.0)
Foreign currency exchange effects	0.0	0.0
End of year - net prior service (cost) credit	81.0	19.2	24.2
U.S. Plans
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	839.5	908.0
Service cost	0.0	0.0	0.0
Interest cost	22.9	21.1	26.7
Participant contributions	0.0	0.0
Plan amendments	0.0	0.0
Plan combinations	0.0	0.0
Settlements	0.0	0.0
Benefits paid	(45.0)	(46.9)
Actuarial gains	(190.2)	(42.7)
Foreign currency exchange effects	0.0	0.0
Benefit obligation at end of year	627.2	839.5	908.0
Changes in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	764.8	747.1
Return on assets – actual	(124.1)	63.9
Participant contributions	0.0	0.0
Plan combinations	0.0	0.0
Employer contributions	0.6	0.7
Settlements	0.0	0.0
Benefits paid	(45.0)	(46.9)
Foreign currency exchange effects	0.0	0.0
Fair value of plan assets at end of year	596.3	764.8	747.1
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(30.9)	(74.7)
Current liability, included in accrued liabilities	0.7	0.6
Noncurrent liability	30.2	74.1
Net pension liability	30.9	74.7
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(228.3)	(321.5)
Net actuarial gains arising during the year	17.4	59.2
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	24.2	34.0
Foreign currency exchange effects	0.0	0.0
End of year - net gains and losses	(186.7)	(228.3)	(321.5)
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
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 arising during the year	193.0	41.0
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 arising during the year	(173.0)	17.0
Non-U.S. Plans
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	492.2	519.8
Service cost	8.1	9.1	9.7
Interest cost	13.1	12.1	11.6
Participant contributions	0.3	0.4
Plan amendments	0.1	(0.7)
Plan combinations	0.9	7.6
Acquisitions	0.0	5.9
Curtailment	(0.4)	(1.1)
Settlements	(10.8)	(14.0)
Benefits paid	(16.1)	(13.8)
Actuarial gains	(127.3)	(16.9)
Foreign currency exchange effects	(25.4)	(16.2)
Benefit obligation at end of year	334.7	492.2	519.8
Changes in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	360.3	355.8
Return on assets – actual	(81.1)	22.8
Participant contributions	0.3	0.4
Plan combinations	0.9	5.0
Employer contributions	14.7	12.5
Settlements	(10.8)	(14.0)
Benefits paid	(16.1)	(13.8)
Foreign currency exchange effects	(22.7)	(8.4)
Fair value of plan assets at end of year	245.5	360.3	355.8
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(89.2)	(131.9)
Noncurrent asset	17.7	18.4
Current liability, included in accrued liabilities	6.1	5.1
Noncurrent liability	100.8	145.2
Net pension liability	89.2	131.9
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(61.3)	(82.4)
Net actuarial gains arising during the year	33.5	10.5
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	5.2	9.9
Foreign currency exchange effects	3.7	0.7
End of year - net gains and losses	(18.9)	(61.3)	(82.4)
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss):
Beginning of year - net prior service (cost) credit	0.1	(0.6)
Prior service credit (cost) from plan amendments during the year	(0.1)	0.7
Foreign currency exchange effects	(0.1)	0.0
End of year - net prior service (cost) credit	(0.1)	0.1	(0.6)
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 arising during the year	133.0
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 arising during the year	(94.0)	10.0
UMWA Plans
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	397.4	440.1
Service cost	0.0	0.0	0.0
Interest cost	10.3	9.8	12.7
Plan amendments	(66.7)	0.0
Benefits paid	(20.3)	(22.9)
Actuarial gains	(86.8)	(29.6)
Foreign currency exchange effects	0.0	0.0
Benefit obligation at end of year	233.9	397.4	440.1
Changes in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	178.0	168.0
Return on assets – actual	(15.1)	32.9
Plan combinations	(3.6)	0.0
Benefits paid	(20.3)	(22.9)
Fair value of plan assets at end of year	139.0	178.0	168.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status	(94.9)	(219.4)
Current liability, included in accrued liabilities	0.0	0.0
Noncurrent liability	94.9	219.4
Net pension liability	94.9	219.4
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(162.4)	(230.1)
Net actuarial gains arising during the year	58.5	50.2
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	10.0	17.5
Foreign currency exchange effects	0.0	0.0
End of year - net gains and losses	(93.9)	(162.4)	(230.1)
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss):
Beginning of year - net prior service (cost) credit	18.6	23.3
Prior service credit (cost) from plan amendments during the year	66.7	0.0
Reclassification adjustment for amortization of prior service cost included in net income (loss)	(4.6)	(4.7)
Foreign currency exchange effects	0.0	0.0
End of year - net prior service (cost) credit	80.7	18.6	23.3
UMWA Plans | Actuarial Gains (Losses) - Change in Discount Rate
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Net actuarial gains arising during the year	78.0	23.0
UMWA Plans | Actuarial Gains (Losses) - Change in Census Data
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Net actuarial gains arising during the year	(12.0)
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 arising during the year	(28.0)	21.0
UMWA Plans | Actuarial Gains (Losses) - Change in Claims Experience
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Net actuarial gains arising during the year	12.0	9.0
Black Lung and Other Plans
Changes in the benefit obligation [Roll Forward]
Benefit obligation at beginning of year	113.0	117.9
Service cost	0.1	0.1	0.1
Interest cost	3.7	3.2	3.8
Plan amendments	0.0	0.0
Benefits paid	(9.0)	(8.1)
Actuarial gains	(18.9)	0.6
Foreign currency exchange effects	0.3	(0.7)
Benefit obligation at end of year	89.2	113.0	117.9
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
Employer contributions	9.0	8.1
Benefits paid	(9.0)	(8.1)
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	(89.2)	(113.0)
Current liability, included in accrued liabilities	9.6	10.2
Noncurrent liability	79.6	102.8
Net pension liability	89.2	113.0
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Beginning of year - net gains and losses	(71.6)	(80.3)
Net actuarial gains arising during the year	18.9	(0.6)
Reclassification adjustment for amortization of prior actuarial losses included in net income (loss)	7.3	9.0
Foreign currency exchange effects	(0.1)	0.3
End of year - net gains and losses	(45.5)	(71.6)	(80.3)
Benefit plan prior service cost recognized in accumulated other comprehensive income (loss):
Beginning of year - net prior service (cost) credit	0.6	0.9
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)	(0.3)	(0.3)
Foreign currency exchange effects	0.0	0.0
End of year - net prior service (cost) credit	0.3	0.6	$ 0.9
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 arising during the year	$ 18.0	4.0
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 arising during the year		(10.0)
Black Lung and Other Plans | Actuarial Gains (Losses) - Change in Claims Experience
Benefit plan net actuarial losses recognized in accumulated other comprehensive income (loss):
Net actuarial gains arising during the year		$ 4.0