Quarterly report pursuant to Section 13 or 15(d)

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

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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Capitalized Contract Cost [Line Items]        
Amortization     $ 92.4 $ 89.5 [1]
Costs To Obtain A Contract [Member]        
Capitalized Contract Cost [Line Items]        
Beginning balance $ 460.0 $ 448.5 464.3 455.0
Capitalization of costs 37.4 37.9 73.3 70.3
Amortization (40.5) (39.1) (80.7) (78.0)
Ending balance 456.9 447.3 456.9 447.3
Costs To Fulfill A Contract [Member]        
Capitalized Contract Cost [Line Items]        
Beginning balance 66.3 65.7 66.1 65.4
Capitalization of costs 6.0 5.9 12.0 11.9
Amortization (5.9) (5.8) (11.7) (11.5)
Ending balance $ 66.4 $ 65.8 $ 66.4 $ 65.8
[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).”