Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (908.9)		$ (1,176.3)		$ (991.7)		$ (1,223.6)
OCI before reclassifications		(14.8)		1.0		(4.0)		6.1
Amounts reclassified from AOCI		13.8		14.2		85.8		56.4
Net current-period OCI		(1.0)		15.2		81.8		62.5
Ending balance		(909.9)		(1,161.1)		(909.9)		(1,161.1)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		17.0		23.7		26.0		21.2
OCI before reclassifications		(9.4)		(0.8)		(18.4)		1.7
Amounts reclassified from AOCI		0.0		0.0		0.0		0.0
Net current-period OCI		(9.4)		(0.8)		(18.4)		1.7
Ending balance		7.6		22.9		7.6		22.9
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(883.0)		(1,086.9)		(947.7)		(1,119.9)
OCI before reclassifications		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI		14.5	[1]	4.0	[2]	79.2	[1]	37.0	[2]
Net current-period OCI		14.5		4.0		79.2		37.0
Ending balance		(868.5)		(1,082.9)		(868.5)		(1,082.9)
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		(65.1)		(55.8)		(64.9)		(55.5)
OCI before reclassifications		(20.6)		(4.2)		(40.8)		(4.5)
Amounts reclassified from AOCI		0.0	[3]	0.0	[3]	20.0	[4]	0.0	[3]
Net current-period OCI		(20.6)		(4.2)		(20.8)		(4.5)
Ending balance		(85.7)		(60.0)		(85.7)		(60.0)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		17.0		23.7		26.0		21.2
OCI before reclassifications		(9.4)		(0.8)		(18.4)		1.7
Amounts reclassified from AOCI	[3]	0.0		0.0		0.0		0.0
Net current-period OCI		(9.4)		(0.8)		(18.4)		1.7
Ending balance		7.6		22.9		7.6		22.9
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		16.8		5.1		5.1		2.1
OCI before reclassifications		5.8		5.2		36.8		10.6
Amounts reclassified from AOCI	[5]	(5.4)		(2.3)		(24.7)		(4.7)
Net current-period OCI		0.4		2.9		12.1		5.9
Ending balance		17.2		8.0		17.2		8.0
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
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		22.4		(38.7)		15.8		(50.3)
OCI before reclassifications		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	[6]	4.7		12.5		11.3		24.1
Net current-period OCI		4.7		12.5		11.3		24.1
Ending balance		27.1		(26.2)		27.1		(26.2)
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

[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 12) and/or loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, UK operations (see Note 5).

[2] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 12).

[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 (see Note 5).

[5] 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 9).

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