Leases (Supplemental Cash Flow Information Related to Leases) (Details) $ in Millions  | 
6 Months Ended | 
|---|---|
| 
 Nov. 30, 2019  
USD ($) 
 | |
| Leases [Abstract] | |
| Cash paid for amounts included in the measurement of lease liabilities | $ 20.9 | 
| Amortization of ROU assets | 17.5 | 
| ROU assets obtained in exchange for new operating lease liabilities | $ 14.2 | 
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- Definition Operating Lease Right Of Use Asset Amortization No definition available. 
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- References No definition available. 
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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