Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (1,133.8)	$ (1,027.8)	$ (1,093.7)
OCI before reclassifications			(136.9)	(132.5)	10.1
Amounts reclassified from AOCI			69.0	26.5	55.8
Net current-period OCI			(67.9)	(106.0)	65.9
Ending balance		$ (1,201.7)	(1,201.7)	(1,133.8)	(1,027.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			11.1	17.3	9.7
OCI before reclassifications			(1.3)	(6.2)	7.6
Amounts reclassified from AOCI			0.0	0.0	0.0
Net current-period OCI			(1.3)	(6.2)	7.6
Ending balance		9.8	9.8	11.1	17.3
Tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio		6.0
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,005.8)	(954.5)	(965.5)
OCI before reclassifications			(141.6)	(107.2)	(32.5)
Amounts reclassified from AOCI	[1]		64.3	55.9	43.5
Net current-period OCI			(77.3)	(51.3)	11.0
Ending balance		(1,083.1)	(1,083.1)	(1,005.8)	(954.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			0.0	0.0	0.0
OCI before reclassifications			0.0	0.0	0.0
Amounts reclassified from AOCI			0.0	0.0	0.0
Net current-period OCI			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			(73.9)	(53.5)	(85.0)
OCI before reclassifications			(2.7)	(20.4)	31.5
Amounts reclassified from AOCI	[2]		0.0	0.0	0.0
Net current-period OCI			(2.7)	(20.4)	31.5
Ending balance		(76.6)	(76.6)	(73.9)	(53.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			11.1	17.3	9.7
OCI before reclassifications			(1.3)	(6.2)	7.6
Amounts reclassified from AOCI	[2]		0.0	0.0	0.0
Net current-period OCI			(1.3)	(6.2)	7.6
Ending balance		9.8	9.8	11.1	17.3
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(4.8)	9.0	2.4
OCI before reclassifications			7.4	(4.9)	11.1
Amounts reclassified from AOCI	[3]		(3.1)	(8.9)	(4.5)
Net current-period OCI			4.3	(13.8)	6.6
Ending balance		(0.5)	(0.5)	(4.8)	9.0
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			0.0	0.0	0.0
OCI before reclassifications			0.0	0.0	0.0
Amounts reclassified from AOCI			0.0	0.0	0.0
Net current-period OCI			0.0	0.0	0.0
Ending balance		0.0	0.0	0.0	0.0
Accumulated Deferred Tax Asset Valuation Allowance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(49.3)	(28.8)	(45.6)
OCI before reclassifications			0.0	0.0	0.0
Amounts reclassified from AOCI	[4]		7.8	(20.5)	16.8
Net current-period OCI			7.8	(20.5)	16.8
Ending balance		(41.5)	(41.5)	(49.3)	(28.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			0.0	0.0	0.0
OCI before reclassifications			0.0	0.0	0.0
Amounts reclassified from AOCI			0.0	0.0	0.0
Net current-period OCI			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 14).

[2] No amounts were reclassified to earnings.

[3] For 2018, following the Company’s January 1, 2018 adoption of changes issued by the FASB related to accounting guidance for derivatives, 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 12). For 2017, amounts related to the effective portion of the derivatives were included in cost of goods sold in the period or periods the hedged item affects earnings, and amounts related to the ineffective portion of the derivatives were presented in selling and administrative expenses on the consolidated statements of operations (see Note 12).

[4] Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates. The 2019 income tax provision includes $6.0 million of tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio that fully settled in the fourth quarter of 2019.