Subsequent Event (Details) (Acquisition [Member], SMSC Acquisition [Member], USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Aug. 09, 2012	Aug. 02, 2012
Acquisition [Member] | SMSC Acquisition [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Aug. 02, 2012
Price Per Share Paid to Acquire Oustanding Shares in Business Acquisition	$ 37.00
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 258.8
Business Acquisition, Cost of Acquired Entity, Cash Paid from Borrowings Under Existing Line of Credit Agreement		600.0
Total cash and investment of acquired company expected at close		$ 193.4