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Other Noncurrent Assets (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Other Noncurrent Assets    
Costs in excess of billings $ 39.0 $ 19.1
Assets under deferred compensation plan 35.7 32.1
Cash surrender value of life insurance 16.8 17.8
License fees 10.6 14.4
Investments in joint ventures 7.6 15.0
Other 9.2 6.5
Other Assets, Noncurrent, Total $ 118.9 $ 104.9