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Commitments and Contingencies (Minimum Future Payment Obligations) (Details)
$ in Millions
May 31, 2016
USD ($)
Commitments and Contingencies [Abstract]  
Year ending May 31, 2017 $ 73.5
Year ending May 31, 2018 20.5
Year ending May 31, 2019 7.6
Year ending May 31, 2020 4.4
Year ending May 31, 2021 3.0
Thereafter $ 0.6