Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Inventories
Finished goods	$ 146.9		$ 186.7
Work in process	6.4		13.5
Raw materials and supplies	12.7		8.6
Total inventories	166.0		208.8
Other Current Assets
Non-trade receivables	15.1		4.3
Deferred income taxes	4.7		6.1
Prepaid expenses	5.4		6.1
Hedging asset	5.5		3.4
Assets held for sale	2.5		3.3
Restricted cash	7.5	[1]	2.2	[1]
Other	20.9		24.3
Total other current assets	61.6		49.7
Property, Plant and Equipment
Property, plant and equipment, gross	222.6		241.4
Less accumulated depreciation	(163.7)		(186.0)
Property, plant and equipment, net	58.9		55.4
Other Assets
Deferred income taxes	9.3		15.8
Pension assets	6.6		5.1
Credit facility fees	2.3		0.3
Other	3.9		3.2
Total other assets	22.1		24.4
Other Current Liabilities
Rebates	44.8		45.2
Accrued copyright levies	27.7		19.7
Employee separation costs	16.7		5.9
Litigation settlement — current	0		18.0
Accrued payroll	11.4		13.2
Accrued royalties	7.5		10.7
Deferred revenue	6.9		2.3
Hedging liability	1.3		1.4
Deferred income taxes	0.3		0.7
Other	41.8		34.1
Total other current liabilities	158.4		151.2
Other Liabilities
Pension liabilities	28.1		29.3
Uncertain tax positions	4.3		17.6
Deferred revenue	2.5		0
Deferred income taxes	2.1		0.1
Other	15.0		22.2
Total other liabilities	52.0		69.2
Allowance for Doubtful Accounts Receivable [Roll Forward]
Reserves and Allowances, Beginning Balance	18.0	[2]	18.4	[2]	20.6	[2]
Additions	10.3	[2]	10.5	[2]	9.0	[2]
Write-offs, net of recoveries	(10.7)	[2]	(12.7)	[2]	(17.0)	[2]
Reserves and Allowances, Ending Balance	18.4	[2]	20.6	[2]	28.6	[2]
Land
Property, Plant and Equipment
Property, plant and equipment, gross	1.2		1.2
Buildings and leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	95.0		92.6
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	124.8		146.1
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, gross	$ 1.6		$ 1.5

[1] Restricted cash at December 31, 2012 primarily includes cash acquired from Nexsan that was previously restricted to specifically fulfill certain obligations of Nexsan.

[2] Accounts receivable reserves and allowances include estimated amounts for customer returns, discounts on payment terms and the inability of certain customers to make the required payment.