Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (731.0)		$ (960.5)		$ (725.2)		$ (991.7)
OCI before reclassifications	(4.3)		(0.4)		(16.8)		10.8
Amounts reclassified from AOCI	19.0		52.0		25.7		72.0
Net current-period OCI	14.7		51.6		8.9		82.8
Ending balance	(716.3)		(908.9)		(716.3)		(908.9)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	12.1		26.7		7.7		26.0
OCI before reclassifications	(5.7)		(9.7)		(1.3)		(9.0)
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period OCI	(5.7)		(9.7)		(1.3)		(9.0)
Ending balance	6.4		17.0		6.4		17.0
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(724.0)		(933.2)		(736.1)		(947.7)
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	12.0	[1]	50.2	[2]	24.1	[1]	64.7	[2]
Net current-period OCI	12.0		50.2		24.1		64.7
Ending balance	(712.0)		(883.0)		(712.0)		(883.0)
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	(71.2)		(72.4)		(70.1)		(64.9)
OCI before reclassifications	(2.4)		(12.7)		(3.5)		(20.2)
Amounts reclassified from AOCI	0.0	[3]	20.0	[4]	0.0	[3]	20.0	[4]
Net current-period OCI	(2.4)		7.3		(3.5)		(0.2)
Ending balance	(73.6)		(65.1)		(73.6)		(65.1)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	12.1		26.7		7.7		26.0
OCI before reclassifications	(5.7)		(9.7)		(1.3)		(9.0)
Amounts reclassified from AOCI	0.0	[3]	0.0	[5]	0.0	[3]	0.0	[5]
Net current-period OCI	(5.7)		(9.7)		(1.3)		(9.0)
Ending balance	6.4		17.0		6.4		17.0
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2.1)		20.0		13.5		5.1
OCI before reclassifications	(1.9)		12.3		(13.3)		31.0
Amounts reclassified from AOCI	2.9	[6]	(15.5)	[7]	(1.3)	[6]	(19.3)	[7]
Net current-period OCI	1.0		(3.2)		(14.6)		11.7
Ending balance	(1.1)		16.8		(1.1)		16.8
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	66.3		25.1		67.5		15.8
OCI before reclassifications	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	4.1	[8]	(2.7)	[9]	2.9	[8]	6.6	[9]
Net current-period OCI	4.1		(2.7)		2.9		6.6
Ending balance	70.4		22.4		70.4		22.4
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.