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v3.19.1

Description of Business, Basis of Presentation, and Significant Accounting Policies (Schedule of Recast of Selected Unaudited Consolidated Statements of Income and Comprehensive Income) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Service revenue | $ 1,047.4 | $ 918.0 | [1] | $ 2,733.7 |  | $ 2,486.2 | [1]
Operating expenses | 325.3 | 272.2 | [1] | 855.7 |  | 752.8 | [1]
Selling, general and administrative expenses | 315.8 | 294.9 | [1] | 879.6 |  | 789.8 | [1]
Total expenses | 641.1 | 567.1 | [1] | 1,735.3 |  | 1,542.6 | [1]
Operating income | 429.3 | 369.0 | [1] | 1,056.8 |  | 989.4 | [1]
Income taxes | 101.0 | 4.1 | [1] | 253.5 |  | 219.1 | [1]
Net income | $ 324.6 | $ 367.2 | [1],[2] | $ 804.0 | [3] | $ 776.4 | [1],[2],[3]
Basic earnings per share | $ 0.90 | $ 1.02 | [1],[2] | $ 2.24 |  | $ 2.16 | [1],[2]
Diluted earnings per share | $ 0.90 | $ 1.01 | [1],[2] | $ 2.22 |  | $ 2.15 | [1],[2]
As Previously Reported [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net income |  |  |  |  |  | $ 705.2 |
As Previously Reported [Member] | ASU 2014-09 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Service revenue |  | $ 848.4 |  |  |  | 2,464.0 |
Operating expenses |  | 270.7 |  |  |  | 751.5 |
Selling, general and administrative expenses |  | 303.3 |  |  |  | 788.6 |
Total expenses |  | 574.0 |  |  |  | 1,540.1 |
Operating income |  | 292.5 |  |  |  | 969.7 |
Income taxes |  | 34.4 |  |  |  | 270.6 |
Net income |  | $ 260.4 |  |  |  | $ 705.2 |
Basic earnings per share |  | $ 0.72 |  |  |  | $ 1.96 |
Diluted earnings per share |  | $ 0.72 |  |  |  | $ 1.95 |
Adjustments [Member] | ASU 2014-09 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Service revenue |  | $ 69.6 |  |  |  | $ 22.2 |
Operating expenses |  | 1.5 |  |  |  | 1.3 |
Selling, general and administrative expenses |  | (8.4) |  |  |  | 1.2 |
Total expenses |  | (6.9) |  |  |  | 2.5 |
Operating income |  | 76.5 |  |  |  | 19.7 |
Income taxes |  | (30.3) |  |  |  | (51.5) |
Net income |  | $ 106.8 |  |  |  | $ 71.2 |
Basic earnings per share |  | $ 0.30 |  |  |  | $ 0.20 |
Diluted earnings per share |  | $ 0.29 |  |  |  | $ 0.20 |
[1] | Amounts have been adjusted to reflect the adoption of Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC Topic 606").
[2] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[3] | 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)."

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