Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2012

Financial Instruments [Abstract]

Input levels and valuation techniques for determination of fair values of financial instruments

	Fair Value Measurements at Reporting Date Using
March 31, 2012	Total		Quoted Prices in  Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Valuation Technique
			(In millions)
Assets
Cash equivalents
Money-market funds	$	769.3	$	769.3	$	—	$	—		A
United States Treasury securities		49.9	$	49.9		—		—		A
Certificates of deposit		45.1		45.1		—		—		A
Short-term and long-term investments
United States Treasury securities		92.2		92.2		—		—		A
Auction rate securities		26.9		—		—		26.9		B
Mutual funds		19.6		19.6		—		—		A
Foreign currency forward contracts		8.1		—		8.1		—		A
Total	$	1,011.1	$	976.1	$	8.1	$	26.9
Liabilities
Foreign currency forward contracts	$	0.6	$	—	$	0.6	$	—		A
Total	$	0.6	$	—	$	0.6	$	—

Summary of activity in Level 3 financial instruments

	Year Ended March 31,
	2012								2011
	Auction Rate Securities			Put Option		Total			Auction Rate Securities			Put Option			Total
						(In millions)
Balance at the beginning of the period	$	27.2		$	—	$	27.2		$	60.5		$	1.1		$	61.6
Redemptions and sales of auction rate securities		(0.5	)		—		(0.5	)		(37.5	)		—			(37.5	)
Change in unrealized gain (loss) included in interest and other income, net		—			—		—			1.1			(1.1	)		—
Change in unrealized gain (loss) included in other comprehensive income (loss)		0.2			—		0.2			3.1			—			3.1
Balance at the end of the period	$	26.9		$	—	$	26.9		$	27.2		$	—		$	27.2

Components of cash, cash equivalents and investments

	March 31,
	2012						2011
	Cash and Cash Equivalents		Short-term Investments		Long-term Investments		Cash and Cash Equivalents		Short-term Investments		Long-term Investments
	(In millions)
Measured at fair value:
Available-for-sale
United States Treasury securities	$	49.9	$	86.1	$	6.1	$	525.0	$	27.8	$	22.1
Certificates of deposit		45.1		—		—		38.4		—		—
Auction rate securities		—		—		26.9		—		—		27.2
Trading
Mutual funds		—		—		19.6		—		—		18.5
Total debt and equity investments measured at fair value		95.0		86.1		52.6		563.4		27.8		67.8
Cash on hand		632.6		—		—		412.8		—		—
Money-market funds		769.3		—		—		684.7		—		—
Total cash, cash equivalents and investments	$	1,496.9	$	86.1	$	52.6	$	1,660.9	$	27.8	$	67.8
Amounts included in accumulated other comprehensive income from available-for-sale securities (pre-tax):
Unrealized losses*	$	—	$	—	$	2.4	$	—	$	—	$	2.6

* The unrealized losses on available-for-sale securities at March 31, 2012 and 2011 relate to the auction rate securities.

Contractual maturities of available-for-sale investments in debt securities

	Year Ended March 31,
	2012				2011
	Cost		Fair Value		Cost		Fair Value
			(In millions)
Due in one year or less	$	181.1	$	181.1	$	591.2	$	591.2
Due between one and two years		6.1		6.1		22.1		22.1
Due after ten years		29.3		26.9		29.8		27.2
Total	$	216.5	$	214.1	$	643.1	$	640.5

Notional amounts at contract exchange rates of foreign currency forward contracts

	Notional Amount
	March 31,
	2012		2011
	(In millions)
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)
Euro	$	214.2	$	158.5
Australian dollar		29.9		13.9
British pound		19.2		5.0
Chinese yuan renminbi		11.7		7.6
Brazilian real		8.7		5.6
Swedish krona		8.2		2.4
Swiss franc		6.8		1.5
Danish krone		3.9		3.0
Singapore dollar		3.8		0.6
New Zealand dollar		3.4		2.9
Mexican peso		3.2		—
South Korean won		2.6		4.6
Canadian dollar		—		4.2
Other		6.4		3.2
Total	$	322.0	$	213.0
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)
Israeli shekel	$	158.2	$	151.6
Mexican peso		—		9.3
Indian rupee		15.0		9.1
Other		4.8		2.2
Total	$	178.0	$	172.2

Finance receivables balance, net of allowance, by region and by class of internal credit rating

	North America		EMEA		Asia Pacific		Latin America		Total
					(In millions)
Class 1	$	73.6	$	40.3	$	12.7	$	1.8	$	128.4
Class 2		26.7		22.7		4.0		4.6		58.0
Class 3		0.1		0.3		0.6		0.7		1.7
Balance at the end of the period	$	100.4	$	63.3	$	17.3	$	7.1	$	188.1