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Description of Business, Basis of Presentation, and Significant Accounting Policies (Schedule of Recast of Selected Unaudited Consolidated Statement of Cash Flow) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Cash flows from operating activities |  |  |  |  |  |
Net income | $ 235.8 | $ 198.8 | [1],[2] | $ 479.4 | $ 409.2 | [1],[2]
Provision for deferred income taxes |  |  |  | 10.9 | 47.2 | [1]
Accounts receivable |  |  |  | (71.6) | (8.5) | [1]
Prepaid expenses and other current assets |  |  |  | (26.7) | (25.8) | [1]
Accounts payable and other current liabilities |  |  |  | (30.2) | (35.5) | [1]
Deferred costs |  |  |  | 7.3 | 10.6 | [1]
Net change in other long-term assets and liabilities |  |  |  | $ (0.4) | 1.1 | [1]
ASU 2014-09 [Member] | As Previously Reported [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net income |  | 217.0 |  |  | 444.8 |
Provision for deferred income taxes |  |  |  |  | 68.4 |
Accounts receivable |  |  |  |  | (56.5) |
Accounts payable and other current liabilities |  |  |  |  | (34.3) |
Deferred costs |  |  |  |  |  |
Net change in other long-term assets and liabilities |  |  |  |  | 1.7 |
ASU 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net income |  | $ (18.2) |  |  | (35.6) |
Provision for deferred income taxes |  |  |  |  | (21.2) |
Accounts receivable |  |  |  |  | 48.0 |
Accounts payable and other current liabilities |  |  |  |  | (1.2) |
Deferred costs |  |  |  |  | 10.6 |
Net change in other long-term assets and liabilities |  |  |  |  | $ (0.6) |
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[2] | Amounts have been adjusted to reflect the adoption of Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC Topic 606").

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