Discontinued Operations - Additional Information (Details)		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 04, 2016 USD ($) trademark	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 29, 2016 USD ($) period agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reclassification of cumulative translation adjustment				$ 0	$ 75,800,000
Current liabilities of discontinued operations		$ 39,700,000		5,300,000	39,700,000
Gain on insurance and asset claim recovery				1,200,000
Severance and other charges				600,000	700,000
Current assets of discontinued operations		10,500,000		500,000	10,500,000
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reclassification of cumulative translation adjustment				0	75,800,000
Current liabilities of discontinued operations		39,700,000		5,300,000	39,700,000
Depreciation and amortization expenses related to the discontinued businesses				0	300,000
Income tax provision related to discontinued operations				(3,400,000)	700,000
Current assets of discontinued operations		10,500,000			10,500,000
Discontinued operations restricted cash		9,400,000			9,400,000
Accounts payable of discontinued operations		22,800,000		900,000	22,800,000
Customer credit and rebate accruals of discontinued operation		3,200,000		700,000	3,200,000
Other current liabilities of discontinued operations		2,700,000		3,700,000	2,700,000
Legal accruals of discontinued operations		11,000,000			11,000,000
Other liabilities of discontinued operations		4,400,000		9,100,000	$ 4,400,000
Withholding tax of discontinued operations				1,000,000
Tax contingencies of discontinued operations				900,000
Other liabilities of discontinued operations, other				2,100,000
Discontinued Operations | Imation Mobile Security (IronKey Brand)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of asset purchase agreements | agreement						2
Discontinued Operations | Imation Mobile Security Excluding Software and Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, total consideration						$ 4,300,000
Discontinued Operations | Imation Mobile Security Software and Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, total consideration						400,000
Current liabilities of discontinued operations						$ 2,000,000
Disposal group, potential earn-outs, number of annual periods subsequent to sale | period						3
Disposal group, potential earn-outs as percentage of contingency amount						10.00%
Disposal group, additional one-time earn-out payment		$ 200,000
Disposal group, gain on disposal			$ 3,800,000
Trademarks | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of trademarks sold (trademark) | trademark	2
Sale of trademarks	$ 9,400,000
IOENGINE | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other liabilities of discontinued operations				4,100,000
CMC | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other liabilities of discontinued operations				1,000,000
CMC Magnetic Corp Versus Imation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain related to litigation settlement				7,300,000
IOENGINE LLC Versus Imation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain related to litigation settlement				3,300,000
Legacy Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on resolution of customer balances				$ 2,500,000