Segment Information - Segment Information by Product (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue from External Customer [Line Items]
Net revenue	$ 248.2	$ 308.6	$ 800.5	$ 948.1
Traditional Storage
Revenue from External Customer [Line Items]
Net revenue	168.5	216.7	544.5	667.1
Traditional Storage, Optical Products
Revenue from External Customer [Line Items]
Net revenue	97.0	126.8	317.8	383.8
Traditional Storage, Magentic Products
Revenue from External Customer [Line Items]
Net revenue	68.3	76.9	215.0	244.7
Traditional Storage, Other
Revenue from External Customer [Line Items]
Net revenue	3.2	13.0	11.7	38.6
Secure and Scalable Storage
Revenue from External Customer [Line Items]
Net revenue	44.5	48.2	147.3	156.3
Audio and Video Information
Revenue from External Customer [Line Items]
Net revenue	$ 35.2	$ 43.7	$ 108.7	$ 124.7