Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Income Tax Examination, Penalties and Interest Accrued	$ 0.1	$ 0.1
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(26.9)	0.0	$ 0.0
Income Tax Expense (Benefit)	(15.9)	13.7	2.7
Income before taxes
United States	2.7	40.5	(187.2)
Foreign	10.9	(2.1)	(14.6)
Income (loss) before income taxes	13.6	38.4	(201.8)
Current:
Federal	6.1	10.0	22.9
State	0.5	1.0	1.1
Foreign	7.3	5.3	3.1
Current income tax expense (benefit)	13.9	16.3	27.1
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	(28.8)	(3.3)	(25.7)
State and local	(0.4)	(0.2)	(0.6)
Foreign	(0.6)	0.9	1.9
Deferred income tax expense (benefit)	(29.8)	(2.6)	(24.4)
Effective Tax Rate Reconciliation
Income tax expense (benefit) at U.S. statutory rate	4.8	13.4	(70.6)
State income taxes, net of federal tax benefit	0.6	0.7	0.4
Foreign income, net of credit on foreign taxes	8.8	0.2	0.0
Effective tax rate differential of earnings outside of U.S.	(0.5)	0.5	0.0
Change in valuation allowance	7.8	6.6	(5.6)
Research & experimentation credits	(0.6)	(0.9)	(0.9)
Non-deductible items	0.6	0.7	2.7
Change in uncertain tax positions	0.1	(0.2)	0.1
Domestic production activities deduction	(0.4)	(1.2)	(2.1)
Tax effect of asset impairments	0.0	0.0	67.3
Effective Income Tax Rate Reconciliation, Insurance Proceeds	0.0	(5.8)	0.0
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	(10.3)	0.0	0.0
Other items	0.1	(0.3)	0.2
Deferred tax assets:
Accruals and reserves	11.8	24.1
Pensions	2.0	5.3
Inventory	4.3	6.8
Stock options	6.6	9.4
Tax credit carryforwards	16.4	2.2
Foreign net operating loss carryforwards	12.4	5.9
State net operating loss carryforward	2.0	1.6
Other - net	0.2	0.9
Total deferred tax assets before valuation allowance	55.7	56.2
Valuation allowance	(27.2)	(15.1)
Total deferred tax assets, net of valuation allowance	28.5	41.1
Deferred tax liabilities:
Property, plant and equipment	15.0	19.4
Intangibles	72.9	22.9
Deferred Tax Liabilities, Convertible Notes	(0.5)	1.0
Deferred Tax Liabilities, Other	2.9	0.0
Deferred Tax Liabilities, Gross, Noncurrent	90.3	43.3
Total deferred tax liabilities	61.8	2.2
Deferred Tax Assets, Net, Noncurrent	(0.7)	(2.0)
Long-term deferred tax liabilities	62.5	4.2
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits Ending Balance Beginning	0.8	1.0	0.9
Additions for tax positions of prior years	0.1	0.0	0.1
Reductions for tax positions of prior years	(0.1)	0.0	0.0
Lapse of statutes of limitation	0.0	(0.2)	0.0
Unrecognized Tax Benefits Ending Balance Ending	0.8	0.8	1.0
Undistributed Earnings of Foreign Subsidiaries		190.4
Tax Cuts and Jobs Act Undistributed Foreign Earnings	200.0
Foreign Earnings Repatriated	50.0
Income Taxes Paid	15.4	17.6	$ 30.5
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0.6	$ 0.6
Net favorable tax benefit due to tax reform	22.5
Deferred income taxes, Deferred tax liabilities provisional decrease	$ (26.9)
Effective income tax rate Jan 1 2018 after tax reform	21.00%
Provisional Tax Expense for Repatriation Transition Tax	$ 8.7
One time tax expense, intent to amend Hudson returns	4.5
One time tax benefit, intent to amend Hudson returns	8.7
Deferred income taxes, Deferred tax liabilities provisional decrease due to tax reform	$ (26.9)