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

3 Months Ended

9 Months Ended

Feb. 28, 2019

Feb. 28, 2019

Feb. 28, 2018

^[2]

Capitalized Contract Cost [Line Items]

Amortization

^[1]

$ 134.8

$ 130.5

Costs To Obtain A Contract [Member]

Capitalized Contract Cost [Line Items]

Beginning balance

$ 447.3

455.0

Capitalization of costs

47.9

118.2

Amortization

(39.6)

(117.6)

Ending balance

455.6

455.6

Costs To Fulfill A Contract [Member]

Capitalized Contract Cost [Line Items]

Beginning balance

65.8

65.4

Capitalization of costs

5.9

17.8

Amortization

(5.7)

(17.2)

Ending balance

$ 66.0

$ 66.0

[1]	Amounts have been adjusted to reflect the 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)."
[2]	Amounts have been adjusted to reflect the adoption of ASC Topic 606.

X

- Definition

Capitalized Contract Cost

+ References

No definition available.

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X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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