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Commitments and Contingencies (Future Minimum Operating Lease Payments) (Details)
$ in Millions
May 31, 2016
USD ($)
Commitments and Contingencies [Abstract]  
Year ending May 31, 2017 $ 35.7
Year ending May 31, 2018 28.5
Year ending May 31, 2019 20.0
Year ending May 31, 2020 12.9
Year ending May 31, 2021 7.4
Thereafter $ 2.2