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Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2016
May 31, 2017
May 31, 2016
May 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restricted cash held in escrow   $ 0.0 $ 9.9  
Working capital adjustment $ 2.9      
Restricted cash released   (9.9) (24.6) $ 34.5
Proceeds from sale of assets   $ 0.0 $ 3.3 $ 0.7