Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (1,216.6)	$ (1,095.5)	$ (1,201.7)	$ (1,133.8)
OCI before reclassifications		16.3	(9.2)	(15.7)	4.6
Amounts reclassified from AOCI		27.5	20.3	44.6	44.8
Net current-period OCI		43.8	11.1	28.9	49.4
Ending balance		(1,172.8)	(1,084.4)	(1,172.8)	(1,084.4)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		9.0	16.3	9.8	11.1
OCI before reclassifications		(0.5)	(3.6)	(1.3)	1.6
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		(0.5)	(3.6)	(1.3)	1.6
Ending balance		8.5	12.7	8.5	12.7
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(1,067.4)	(989.7)	(1,083.1)	(1,005.8)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[1]	15.6	16.3	31.3	32.4
Net current-period OCI		15.6	16.3	31.3	32.4
Ending balance		(1,051.8)	(973.4)	(1,051.8)	(973.4)
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
Currency translation adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(99.2)	(68.1)	(76.6)	(73.9)
OCI before reclassifications		14.7	(4.9)	(7.9)	0.9
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		14.7	(4.9)	(7.9)	0.9
Ending balance		(84.5)	(73.0)	(84.5)	(73.0)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		9.0	16.3	9.8	11.1
OCI before reclassifications		(0.5)	(3.6)	(1.3)	1.6
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		(0.5)	(3.6)	(1.3)	1.6
Ending balance		8.5	12.7	8.5	12.7
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(8.5)	3.9	(0.5)	(4.8)
OCI before reclassifications		1.6	(4.3)	(7.8)	3.7
Amounts reclassified from AOCI	[3]	3.2	0.4	4.6	1.1
Net current-period OCI		4.8	(3.9)	(3.2)	4.8
Ending balance		(3.7)	0.0	(3.7)	0.0
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		(41.5)	(41.6)	(41.5)	(49.3)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[4]	8.7	3.6	8.7	11.3
Net current-period OCI		8.7	3.6	8.7	11.3
Ending balance		(32.8)	(38.0)	(32.8)	(38.0)
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

[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 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.