Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (1,172.8)	$ (1,084.4)	$ (1,201.7)	$ (1,133.8)
OCI before reclassifications		21.9	(1.1)	6.2	3.5
Amounts reclassified from AOCI		22.3	24.1	66.9	68.9
Net current-period OCI		44.2	23.0	73.1	72.4
Ending balance		(1,128.6)	(1,061.4)	(1,128.6)	(1,061.4)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		8.5	12.7	9.8	11.1
OCI before reclassifications		6.0	(4.6)	4.7	(3.0)
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		6.0	(4.6)	4.7	(3.0)
Ending balance		14.5	8.1	14.5	8.1
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(1,051.8)	(973.4)	(1,083.1)	(1,005.8)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[1]	15.6	16.1	46.9	48.5
Net current-period OCI		15.6	16.1	46.9	48.5
Ending balance		(1,036.2)	(957.3)	(1,036.2)	(957.3)
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		(84.5)	(73.0)	(76.6)	(73.9)
OCI before reclassifications		17.2	(11.7)	9.3	(10.8)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		17.2	(11.7)	9.3	(10.8)
Ending balance		(67.3)	(84.7)	(67.3)	(84.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		8.5	12.7	9.8	11.1
OCI before reclassifications		6.0	(4.6)	4.7	(3.0)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		6.0	(4.6)	4.7	(3.0)
Ending balance		14.5	8.1	14.5	8.1
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(3.7)	0.0	(0.5)	(4.8)
OCI before reclassifications		4.7	10.6	(3.1)	14.3
Amounts reclassified from AOCI	[3]	0.3	(0.7)	4.9	0.4
Net current-period OCI		5.0	9.9	1.8	14.7
Ending balance		1.3	9.9	1.3	9.9
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
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(32.8)	(38.0)	(41.5)	(49.3)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[4]	6.4	8.7	15.1	20.0
Net current-period OCI		6.4	8.7	15.1	20.0
Ending balance		(26.4)	(29.3)	(26.4)	(29.3)
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] No amounts were reclassified to earnings.

[3] 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 9).

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