Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Capitalized Contract Cost [Line Items]      
Amortization $ 191.4 $ 186.1 $ 180.2
Costs To Fulfill Contracts [Member]      
Capitalized Contract Cost [Line Items]      
Balance, beginning of period 67.3 66.1  
Capitalization of costs 26.2 24.9  
Amortization (24.2) (23.7)  
Balance, end of period 69.3 67.3 66.1
Costs To Obtain Contracts [Member]      
Capitalized Contract Cost [Line Items]      
Balance, beginning of period 473.6 464.3  
Capitalization of costs 181.8 171.7  
Amortization (167.2) (162.4)  
Balance, end of period $ 488.2 $ 473.6 $ 464.3