Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities of discontinued operations	$ 6.2	$ 6.2	$ 5.3
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Increase in loss from discontinued operations, net of tax	1.9	3.5
Current liabilities of discontinued operations	6.2	6.2	5.3
Accounts payable of discontinued operations	2.0	2.0	0.9
Customer credit and rebate accruals of discontinued operations	0.6	0.6	0.7
Other current liabilities of discontinued operations	2.9	2.9	3.7
Other liabilities of discontinued operations	8.3	8.3	9.1
Withholding tax of discontinued operations	1.0	1.0	1.0
Tax contingencies of discontinued operations	0.8	0.8	0.9
Other liabilities of discontinued operations, other	2.1	2.1	2.1
Discontinued Operations | IOENGINE
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities due to related party, discontinued operations	0.7	0.7
Other liabilities of discontinued operations	3.4	3.4	4.1
Discontinued Operations | CMC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other liabilities of discontinued operations	$ 1.0	$ 1.0	$ 1.0