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Other Noncurrent Assets (Details) - USD ($)
$ in Millions
May 31, 2016
May 31, 2015
Other Noncurrent Assets    
Assets under deferred compensation plan $ 28.8 $ 28.8
Cash surrender value of life insurance 17.7 17.5
License fees 15.5 12.2
Costs in excess of billings 14.9 14.4
Other 10.1 9.7
Other Assets, Noncurrent, Total $ 87.0 $ 82.6