Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details)

v3.19.3
Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Capitalized Contract Cost [Line Items]    
Amortization $ 46.0 $ 44.6 [1]
Costs To Obtain A Contract [Member]    
Capitalized Contract Cost [Line Items]    
Beginning balance 464.3 455.0
Capitalization of costs 35.9 32.4
Amortization (40.2) (38.9)
Ending balance 460.0 448.5
Costs To Fulfill A Contract [Member]    
Capitalized Contract Cost [Line Items]    
Beginning balance 66.1 65.4
Capitalization of costs 6.0 6.0
Amortization (5.8) (5.7)
Ending balance $ 66.3 $ 65.7
[1] Amounts have been adjusted to reflect adoption of Accounting Standards Update (“ASU”) No. 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force).”