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Other Noncurrent Assets (Details) (USD $)
In Millions, unless otherwise specified
May 31, 2013
May 31, 2012
Other Noncurrent Assets    
Assets under deferred compensation plan $ 20.7 $ 16.3
Notes receivable 16.8 18.9
Cash surrender value of life insurance 16.5 15.6
License fees 14.7 15.1
Debt issuance costs 11.9 10.0
Costs in excess of billings 9.9 27.9
Other 16.2 13.2
Other Noncurrent Assets $ 106.7 $ 117.0