Acquisitions and Divestitures Acquisitions and Divestitures - Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended						0 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended					0 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Oct. 15, 2013 Receivable	Oct. 15, 2013 Memorex Consumer Electronics Business [Member]	Dec. 31, 2013 Memorex Consumer Electronics Business [Member]	Dec. 31, 2013 Memorex Consumer Electronics Business [Member]	Dec. 31, 2013 XtremeMac Business [Member]	Dec. 31, 2013 XtremeMac Business [Member]	Dec. 31, 2013 Other Assets Memorex Consumer Electronics Business [Member]	Dec. 31, 2013 Other Current Assets Memorex Consumer Electronics Business [Member]	Oct. 15, 2013 First Receivable [Member] Memorex Consumer Electronics Business [Member]	Oct. 15, 2013 Second Receivable [Member] Memorex Consumer Electronics Business [Member]	Oct. 15, 2013 To Be Received in 2014 [Member] Memorex Consumer Electronics Business [Member]	Oct. 15, 2013 To Be Received in 2018 [Member] Memorex Consumer Electronics Business [Member]	Jan. 31, 2014 Subsequent Event [Member] XtremeMac Business [Member]
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
Note receivable																				2.9		3.8	5.5			0.3
Sale of business, total consideration to be paid in annual increments																								0.2	2.2
Cash payment received from sale of business																0.9										0.3
Estimated fair value of receivable																4.0	4.0			3.8	0.2
Discount rate used in calculating fair value of contingent consideration																9.00%
Sale of business, estimated additional cash consideration																										3.0
Asset impairment charges									7.1		285.7		8.6						6.7
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenue									40.7		92.9		123.8
Gain on sale of discontinued businesses, net of income taxes									0.9		0		0				0.9
Loss from operations of discontinued businesses, before income taxes									(14.2)		(17.7)		(12.7)
Adjustment to carrying value of disposal group									(6.7)		0		0					(1.2)
Income tax benefit									0		(1.8)		(1.2)
Loss from discontinued businesses, net of income taxes	(2.5)	(8.7)	(3.3)	(5.5)	(7.9)	(2.5)	(2.5)	(3.0)	(20.0)	[1]	(15.9)	[1]	(11.5)
Assets classified as held for sale	$ 5.2				$ 2.5				$ 5.2		$ 2.5

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