Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (1,201.7)		$ (1,133.8)
OCI before reclassifications	(32.0)		13.8
Amounts reclassified from AOCI	17.1		24.5
Net current-period OCI	(14.9)		38.3
Ending balance	(1,216.6)		(1,095.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	9.8		11.1
OCI before reclassifications	(0.8)		5.2
Amounts reclassified from AOCI	0.0		0.0
Net current-period OCI	(0.8)		5.2
Ending balance	9.0		16.3
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,083.1)		(1,005.8)
OCI before reclassifications	0.0		0.0
Amounts reclassified from AOCI	15.7	[1]	16.1	[2]
Net current-period OCI	15.7		16.1
Ending balance	(1,067.4)		(989.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0
OCI before reclassifications	0.0		0.0
Amounts reclassified from AOCI	0.0		0.0
Net current-period OCI	0.0		0.0
Ending balance	0.0		0.0
Currency translation adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(76.6)		(73.9)
OCI before reclassifications	(22.6)		5.8
Amounts reclassified from AOCI	0.0	[3]	0.0	[4]
Net current-period OCI	(22.6)		5.8
Ending balance	(99.2)		(68.1)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	9.8		11.1
OCI before reclassifications	(0.8)		5.2
Amounts reclassified from AOCI	0.0	[3]	0.0	[4]
Net current-period OCI	(0.8)		5.2
Ending balance	9.0		16.3
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(0.5)		(4.8)
OCI before reclassifications	(9.4)		8.0
Amounts reclassified from AOCI	1.4	[5]	0.7	[6]
Net current-period OCI	(8.0)		8.7
Ending balance	(8.5)		3.9
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0
OCI before reclassifications	0.0		0.0
Amounts reclassified from AOCI	0.0		0.0
Net current-period OCI	0.0		0.0
Ending balance	0.0		0.0
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(41.5)		(49.3)
OCI before reclassifications	0.0		0.0
Amounts reclassified from AOCI	0.0		7.7	[7]
Net current-period OCI	0.0		7.7
Ending balance	(41.5)		(41.6)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0.0		0.0
OCI before reclassifications	0.0		0.0
Amounts reclassified from AOCI	0.0		0.0
Net current-period OCI	0.0		0.0
Ending balance	$ 0.0		$ 0.0

[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

[2] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

[3] No amounts were reclassified to earnings.

[4] No amounts were reclassified to earnings.

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

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

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