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Special Charges (Details) (Unusual or Infrequent Item [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012 SMSC Acquisition [Member]	Dec. 31, 2012 SMSC Acquisition [Member]	Sep. 30, 2012 SST acquisition [Member]	Dec. 31, 2012 SST acquisition [Member]
Unusual or Infrequent Item [Line Items]
Severance-Related, Office Closing Costs and Other Restructuring Costs	$ 0.8	$ 2.5	$ 2.6	$ 13.4
Legal settlement costs					$ 11.5	$ 11.5

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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