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Other Noncurrent Assets (Details) - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Other Noncurrent Assets    
Assets under deferred compensation plan $ 28.8 $ 23.7
Cash surrender value of life insurance 17.5 17.3
Costs in excess of billings 14.4 15.1
License fees 12.2 13.0
Notes receivable 4.3 5.2
Debt issuance costs 2.6 9.6
Other 5.4 16.2
Other Assets, Noncurrent, Total $ 85.2 $ 100.1