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v3.10.0.1

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 | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Service revenue | $ 840.6 | $ 789.0 | [1] | $ 1,686.3 | $ 1,568.2 | [1]
Operating expenses | 264.9 | 248.6 | [1] | 530.4 | 480.6 | [1]
Selling, general and administrative expenses | 286.8 | 251.3 | [1] | 563.8 | 494.9 | [1]
Total expenses | 551.7 | 499.9 | [1] | 1,094.2 | 975.5 | [1]
Operating income | 307.2 | 303.1 | [1] | 627.5 | 620.4 | [1]
Income taxes | 73.5 | 106.0 | [1] | 152.5 | 215.0 | [1]
Net income | $ 235.8 | $ 198.8 | [1],[2] | $ 479.4 | $ 409.2 | [1],[2]
Basic earnings per share | $ 0.66 | $ 0.55 | [1],[2] | $ 1.34 | $ 1.14 | [1],[2]
Diluted earnings per share | $ 0.65 | $ 0.55 | [1],[2] | $ 1.33 | $ 1.13 | [1],[2]
As Previously Reported [Member] | ASU 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Service revenue |  | $ 812.5 |  |  | $ 1,615.6 |
Operating expenses |  | 248.7 |  |  | 480.8 |
Selling, general and administrative expenses |  | 245.6 |  |  | 485.3 |
Total expenses |  | 494.3 |  |  | 966.1 |
Operating income |  | 332.2 |  |  | 677.2 |
Income taxes |  | 116.9 |  |  | 236.2 |
Net income |  | $ 217.0 |  |  | $ 444.8 |
Basic earnings per share |  | $ 0.60 |  |  | $ 1.24 |
Diluted earnings per share |  | $ 0.60 |  |  | $ 1.23 |
Adjustments [Member] | ASU 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Service revenue |  | $ (23.5) |  |  | $ (47.4) |
Operating expenses |  | (0.1) |  |  | (0.2) |
Selling, general and administrative expenses |  | 5.7 |  |  | 9.6 |
Total expenses |  | 5.6 |  |  | 9.4 |
Operating income |  | (29.1) |  |  | (56.8) |
Income taxes |  | (10.9) |  |  | (21.2) |
Net income |  | $ (18.2) |  |  | $ (35.6) |
Basic earnings per share |  | $ (0.05) |  |  | $ (0.10) |
Diluted earnings per share |  | $ (0.05) |  |  | $ (0.10) |
[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.

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