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Commitments and Contingencies (Minimum Future Payment Obligations) (Details)
$ in Millions
May 31, 2017
USD ($)
Commitments and Contingencies [Abstract]  
Year ending May 31, 2018 $ 78.8
Year ending May 31, 2019 25.1
Year ending May 31, 2020 19.3
Year ending May 31, 2021 3.4
Year ending May 31, 2022 0.8
Year ending May 31, Thereafter