Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2012

Intangible Assets and Goodwill [Abstract]

Intangible assets

	March 31,
	2012				2011
	Gross Carrying Amount		Net Book Value		Gross Carrying Amount		Net Book Value
			(In millions)
Acquired technology	$	658.3	$	78.1	$	572.4	$	64.2
Customer relationships		441.9		177.7		255.6		36.7
Tradenames and trademarks		45.5		1.7		29.3		—
Total intangible assets	$	1,145.7	$	257.5	$	857.3	$	100.9

Future amortization expense associated with intangible assets

	Year Ending March 31,
	(In millions)
2013	$	82.8
2014		69.2
2015		46.1
2016		32.3
2017		27.1
	$	257.5

Summary of goodwill activity and ending goodwill balances by operating segment

	Enterprise Service Management			Mainframe Service Management			Total
				(In millions)
Balance at March 31, 2010	$	1,279.8		$	85.8		$	1,365.6
Goodwill acquired/purchase accounting adjustments during the year		32.6			(1.0	)		31.6
Effect of foreign currency exchange rate changes		9.8			—			9.8
Balance at March 31, 2011		1,322.2			84.8			1,407.0
Goodwill acquired/purchase accounting adjustments during the year		302.1			16.3			318.4
Effect of foreign currency exchange rate changes		(4.8	)		—			(4.8	)
Balance at March 31, 2012	$	1,619.5		$	101.1		$	1,720.6