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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
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Aug. 31, 2018 | Aug. 31, 2017
Cash flows from operating activities |  |  |
Net income | $ 243.6 | $ 210.4 | [1],[2]
Provision for deferred income taxes | 2.6 | 48.9 | [1]
Accounts receivable | (43.0) | 8.8 | [1]
Deferred costs | 6.2 | 4.2 | [1]
Accounts payable and other current liabilities | (15.2) | (19.8) | [1]
Net change in other long-term assets and liabilities | $ (0.4) | 0.5 | [1]
ASU 2014-09 [Member] | As Previously Reported [Member] |  |  |
Cash flows from operating activities |  |  |
Net income |  | 227.8 |
Provision for deferred income taxes |  | 59.2 |
Accounts receivable |  | (15.4) |
Accounts payable and other current liabilities |  | (19.2) |
Net change in other long-term assets and liabilities |  | 0.6 |
ASU 2014-09 [Member] | Adjustments [Member] |  |  |
Cash flows from operating activities |  |  |
Net income |  | (17.4) |
Provision for deferred income taxes |  | (10.3) |
Accounts receivable |  | 24.2 |
Deferred costs |  | 4.2 |
Accounts payable and other current liabilities |  | (0.6) |
Net change in other long-term assets and liabilities |  | $ (0.1) |
[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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