Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Current:
Total current deferred revenue	$ 1,059.5	$ 1,026.9
Long-term:
Total long-term deferred revenue	934.4	928.6
Total deferred revenue	1,993.9	1,955.5
Maintenance [Member]
Current:
Total current deferred revenue	699.1	653.1
Long-term:
Total long-term deferred revenue	568.1	581.3
License [Member]
Current:
Total current deferred revenue	328.0	338.8
Long-term:
Total long-term deferred revenue	362.7	347.3
Professional Services [Member]
Current:
Total current deferred revenue	32.4	35.0
Long-term:
Total long-term deferred revenue	$ 3.6