Income Taxes (Deferred Tax Assets (Liabilities)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 30, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Net operating loss and tax credit carryforwards	$ 179.5	$ 128.2
Deferred employee benefit expenses	22.8	36.5
Amortizable intangibles	34.8	32.4
Inventory reserves	30.6	24.6
Accrued liabilities	14.7	22.4
Deferred compensation plan	13.7	12.9
Restructuring accruals	5.7	3.5
Deferred revenue and advance payments	4.8	2.2
Fixed assets and depreciation		1.2
Other	11.3	12.8
Deferred tax assets	317.9	276.7
Unrealized gain on marketable securities	(196.0)	(195.3)
Fixed assets and depreciation	(0.5)
Other	(5.1)	(8.1)
Deferred tax liabilities	(201.6)	(203.4)
Valuation allowance	(113.8)	(71.7)
Net deferred tax assets	$ 2.5	$ 1.6