Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Income before income taxes:
Domestic	$ 82.2	$ 28.3	$ 72.7
Foreign	162.7	182.6	93.3
Income (loss) from continuing operations before income taxes	244.9	210.9	166.0
Provision for income taxes:
Federal-current	(4.9)
Federal-deferred	(29.3)	(144.6)	(11.8)
State and local-current	1.6	0.2	(0.7)
State and local - deferred	(3.5)	(1.7)	(17.7)
Foreign-current	(49.9)	(50.8)	(36.6)
Foreign-deferred	7.9	(3.6)	7.8
(Provision for) benefit from income taxes	$ (78.1)	$ (200.5)	$ (59.0)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Income tax provision analysis
Tax provision at U.S. federal income tax rate	$ (51.4)	$ (73.8)	$ (58.1)
Effective Income Tax Rate Reconciliation, Tax Reform, Amount	(17.1)	143.0	0.0	$ 125.9
Change in provision resulting from:
Effective Income Tax Rate Reconciliation, GILTI, Amount	(24.1)	0.0	0.0
Effective Income Tax Rate Reconciliation, Tax Reform, Amount	17.1	(143.0)	0.0	(125.9)
Effect of tax rates in foreign jurisdictions	(11.3)	13.3	6.8
Research and development credit	9.4	5.1	0.0
U.S. tax on foreign earnings	(6.8)	(1.2)	(0.9)
Decrease (increase) in valuation allowance	(6.3)	(0.3)	(2.5)
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	5.7	0.0	0.0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	2.8	4.5	(2.7)
Effective income tax rate reconciliation, Limitation on executive compensation, Amount	(2.7)	(0.1)	(0.4)
State and local income taxes, net	(1.9)	(1.8)	(4.7)
Nontaxable income/non-deductible expenses	(1.6)	(2.6)	(2.5)
Stock option exercises	(0.7)	2.8	6.7
Other	(6.3)	(3.4)	(0.7)
(Provision for) benefit from income taxes	(78.1)	(200.5)	$ (59.0)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	(4.9)	120.1		115.2
Income tax expense, repatriation of foreign earnings	(9.5)	37.4		27.9
Income tax expense, state and foreign taxes on unremitted earnings	2.7	(4.9)		(2.2)
Deferred tax assets:
Federal tax credit carryforwards	291.0	269.6		291.0
Pension liabilities	82.7	104.8		82.7
U.S. net operating loss carryforwards	44.3	89.5		44.3
State net operating loss carryforwards	52.9	58.2		52.9
Research and development	24.6	22.8		24.6
Prepaid royalties	3.0	21.4		3.0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	6.5	4.2		6.5
Deferred Tax Assets, Unrealized Currency Losses	12.8	0.0		12.8
Liability for environmental remediation	29.3	16.4		29.3
Reserves and allowances	22.8	15.2		22.8
Foreign net operating loss carryforwards	5.7	6.6		5.7
Other	6.5	10.3		6.5
Total deferred tax assets	582.1	619.0		582.1
Deferred tax liabilities:
Properties and equipment	(13.2)	(32.0)		(13.2)
Intangible assets	(24.9)	(15.1)		(24.9)
Other	(5.6)	(11.3)		(5.6)
Total deferred tax liabilities	(43.7)	(58.4)		(43.7)
Valuation allowance:
Decrease (Increase) in deferred tax assets	29.8
Total valuation allowance	(19.9)	(12.3)		(19.9)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(7.6)
Net deferred tax assets	518.5	548.3		518.5
State and Local Jurisdiction [Member]
Valuation allowance:
Total valuation allowance	(6.6)	(9.2)		(6.6)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	2.6
Domestic Tax Authority [Member]
Valuation allowance:
Total valuation allowance	(5.2)	(0.3)		(5.2)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(4.9)
Foreign Tax Authority- NOLs [Member]
Valuation allowance:
Total valuation allowance	(4.2)	(2.8)		(4.2)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(1.4)
Foreign Tax Authority- Other Deferred Tax Assets [Member]
Valuation allowance:
Total valuation allowance	(3.9)			(3.9)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(3.9)
Deferred Tax Asset Deferred Federal Credits [Member]
Valuation allowance:
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	0.0	17.4		17.4
Net Operating Loss [Member] | State and Local Jurisdiction [Member]
Valuation allowance:
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0.0	$ 2.0		$ 2.0