Acquisitions and Divestitures - Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended					0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Jan. 31, 2014	Oct. 15, 2013 Receivable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total impairment charge									$ 1.8		$ 0		$ 0
Asset disposals and write-downs									37.8		7.1		285.7
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenue									0.4		40.7		92.9
(Loss) gain on sale of discontinued businesses, net of income taxes									(1.7)		0.9		0
Loss from operations of discontinued businesses, before income taxes									(0.6)		(14.2)		(17.7)
Increase (decrease) in adjustment to carrying value of disposal group									0		6.7		0
Income tax benefit									0		0		(1.8)
Loss from discontinued operations	0	0	(1.6)	(0.7)	(2.5)	(8.7)	(3.3)	(5.5)	(2.3)	[1]	(20.0)	[1]	(15.9)
Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, total consideration															9.3
Number of receivables from purchaser															2
Cash payment received from sale of business					0.9				1.6
Estimated fair value of receivable	4.5				4.0				4.5		4.0
Discount rate used in calculating fair value of contingent consideration	9.00%										9.00%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
(Loss) gain on sale of discontinued businesses, net of income taxes									0.9
XtremeMac Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash payment received from sale of business														0.3
Notes receivable														0.3
Total impairment charge											(6.7)
First Receivable | Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable															3.8
First Receivable | Other Current Assets | Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable	1.3				2.9				1.3		2.9
Second Receivable | Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable															5.5
To Be Received in 2014 | Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable															0.2
To Be Received in 2018 | Memorex Consumer Electronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent consideration note receivable increments, high range															2.2
Notes Receivable | XtremeMac Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Decrease in expected contingent consideration receivable											1.2
Future Proceeds from Sale of Acquired Inventory | XtremeMac Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business, total consideration														3.0
Loss from Discontinued Operations | XtremeMac Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset disposals and write-downs									$ 1.2		$ 1.2

[1] The sum of the quarterly loss per share may not equal the annual loss per share due to changes in average shares outstanding.