Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (716.3)		$ (908.9)		$ (725.2)		$ (991.7)
OCI before reclassifications	(9.5)		(14.8)		(26.3)		(4.0)
Amounts reclassified from AOCI	16.9		13.8		42.6		85.8
Net current-period OCI	7.4		(1.0)		16.3		81.8
Ending balance	(708.9)		(909.9)		(708.9)		(909.9)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	6.4		17.0		7.7		26.0
OCI before reclassifications	(2.1)		(9.4)		(3.4)		(18.4)
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period OCI	(2.1)		(9.4)		(3.4)		(18.4)
Ending balance	4.3		7.6		4.3		7.6
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(712.0)		(883.0)		(736.1)		(947.7)
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	12.1	[1]	14.5	[2]	36.2	[1]	79.2	[2]
Net current-period OCI	12.1		14.5		36.2		79.2
Ending balance	(699.9)		(868.5)		(699.9)		(868.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0		0.0		0.0
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period OCI	0.0		0.0		0.0		0.0
Ending balance	0.0		0.0		0.0		0.0
Currency translation adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(73.6)		(65.1)		(70.1)		(64.9)
OCI before reclassifications	(7.1)		(20.6)		(10.6)		(40.8)
Amounts reclassified from AOCI	0.0	[3]	0.0	[3]	0.0	[3]	20.0	[4]
Net current-period OCI	(7.1)		(20.6)		(10.6)		(20.8)
Ending balance	(80.7)		(85.7)		(80.7)		(85.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	6.4		17.0		7.7		26.0
OCI before reclassifications	(2.1)		(9.4)		(3.4)		(18.4)
Amounts reclassified from AOCI	0.0	[3]	0.0	[5]	0.0	[3]	0.0	[5]
Net current-period OCI	(2.1)		(9.4)		(3.4)		(18.4)
Ending balance	4.3		7.6		4.3		7.6
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1.1)		16.8		13.5		5.1
OCI before reclassifications	(2.4)		5.8		(15.7)		36.8
Amounts reclassified from AOCI	1.4	[6]	(5.4)	[7]	0.1	[6]	(24.7)	[7]
Net current-period OCI	(1.0)		0.4		(15.6)		12.1
Ending balance	(2.1)		17.2		(2.1)		17.2
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0		0.0		0.0
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period OCI	0.0		0.0		0.0		0.0
Ending balance	0.0		0.0		0.0		0.0
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	70.4		22.4		67.5		15.8
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	3.4	[8]	4.7	[9]	6.3	[8]	11.3	[9]
Net current-period OCI	3.4		4.7		6.3		11.3
Ending balance	73.8		27.1		73.8		27.1
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0		0.0		0.0
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period OCI	0.0		0.0		0.0		0.0
Ending balance	$ 0.0		$ 0.0		$ 0.0		$ 0.0

[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 11).

[2] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 11) and/or loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, UK operations.

[3] No amounts were reclassified to earnings.

[4] Amounts were included in loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, UK operations.

[5] No amounts were reclassified to earnings.

[6] Amounts related to derivatives are included in sales, cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

[7] Amounts related to derivatives are included in sales, cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

[8] Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

[9] Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.