Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (960.5)		$ (1,208.6)		$ (991.7)		$ (1,223.6)
OCI before reclassifications		(0.4)		10.2		10.8		5.1
Amounts reclassified from AOCI		52.0		22.1		72.0		42.2
Net current-period OCI		51.6		32.3		82.8		47.3
Ending balance		(908.9)		(1,176.3)		(908.9)		(1,176.3)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		26.7		21.8		26.0		21.2
OCI before reclassifications		(9.7)		1.9		(9.0)		2.5
Amounts reclassified from AOCI		0.0		0.0		0.0		0.0
Net current-period OCI		(9.7)		1.9		(9.0)		2.5
Ending balance		17.0		23.7		17.0		23.7
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(933.2)		(1,103.4)		(947.7)		(1,119.9)
OCI before reclassifications		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI		50.2	[1]	16.5	[2]	64.7	[1]	33.0	[2]
Net current-period OCI		50.2		16.5		64.7		33.0
Ending balance		(883.0)		(1,086.9)		(883.0)		(1,086.9)
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		(72.4)		(60.9)		(64.9)		(55.5)
OCI before reclassifications		(12.7)		5.1		(20.2)		(0.3)
Amounts reclassified from AOCI		20.0	[3]	0.0	[4]	20.0	[3]	0.0	[4]
Net current-period OCI		7.3		5.1		(0.2)		(0.3)
Ending balance		(65.1)		(55.8)		(65.1)		(55.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		26.7		21.8		26.0		21.2
OCI before reclassifications		(9.7)		1.9		(9.0)		2.5
Amounts reclassified from AOCI	[4]	0.0		0.0		0.0		0.0
Net current-period OCI		(9.7)		1.9		(9.0)		2.5
Ending balance		17.0		23.7		17.0		23.7
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		20.0		1.1		5.1		2.1
OCI before reclassifications		12.3		5.1		31.0		5.4
Amounts reclassified from AOCI	[5]	(15.5)		(1.1)		(19.3)		(2.4)
Net current-period OCI		(3.2)		4.0		11.7		3.0
Ending balance		16.8		5.1		16.8		5.1
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
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		25.1		(45.4)		15.8		(50.3)
OCI before reclassifications		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	[6]	(2.7)		6.7		6.6		11.6
Net current-period OCI		(2.7)		6.7		6.6		11.6
Ending balance		22.4		(38.7)		22.4		(38.7)
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] 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).

[4] No amounts were reclassified to earnings.

[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.