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v3.19.2

Description of Business, Basis of Presentation, and Significant Accounting Policies (Schedule of Recast of Selected Consolidated Statements of Income and Comprehensive Income) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | [1] | Feb. 28, 2018 | [1] | Nov. 30, 2017 | [1] | Aug. 31, 2017 | [1] | May 31, 2019 | May 31, 2018 | May 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue | $ 958.2 |  | $ 1,047.4 |  | $ 840.6 |  | $ 845.7 |  | $ 828.0 |  | $ 918.0 |  | $ 789.0 |  | $ 779.2 |  | $ 3,691.9 |  | $ 3,314.2 | [1],[2] | $ 3,102.4 | [2],[3]
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,177.8 |  | 1,018.2 | [2] | 919.4 | [2]
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,223.4 |  | 1,068.0 | [2] | 979.7 | [2]
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,401.2 |  | 2,086.2 | [2] | 1,899.1 | [2]
Operating income | 314.5 |  | 429.3 |  | 307.2 |  | 320.3 |  | 302.1 |  | 369.0 |  | 303.1 |  | 317.3 |  | 1,371.3 |  | 1,291.5 | [1],[2] | 1,253.9 | [2]
Income taxes | 80.1 |  | 101.0 |  | 73.5 |  | 79.0 |  | 86.9 | [4] | 4.1 | [4] | 106.0 | [4] | 109.0 | [4] | 333.6 |  | 306.0 | [1],[2],[4] | 432.8 | [2],[5]
Net income | $ 230.4 |  | $ 324.6 |  | $ 235.8 |  | $ 243.6 |  | $ 217.7 |  | $ 367.2 |  | $ 198.8 |  | $ 210.4 |  | $ 1,034.4 |  | $ 994.1 | [1],[2],[6] | $ 826.3 | [2],[3],[6]
Basic earnings per share | $ 0.64 | [7] | $ 0.90 | [7] | $ 0.66 | [7] | $ 0.68 | [7] | $ 0.61 | [7] | $ 1.02 | [7] | $ 0.55 | [7] | $ 0.59 | [7] | $ 2.88 | [7] | $ 2.77 | [1],[2],[7] | $ 2.30 | [2],[3]
Diluted earnings per share | $ 0.64 | [7] | $ 0.90 | [7] | $ 0.65 | [7] | $ 0.67 | [7] | $ 0.60 | [7] | $ 1.01 | [7] | $ 0.55 | [7] | $ 0.58 | [7] | $ 2.86 | [7] | $ 2.75 | [1],[2],[7] | 2.28 | [2],[3],[8]
Impact diluted earnings per share amount +/- due to rounding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,317.4 |  | $ 3,100.7 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,017.8 |  | 919.6 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,075.6 |  | 992.1 |
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,093.4 |  | 1,911.7 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,287.5 |  | 1,239.6 |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 362.4 |  | 427.5 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 933.7 |  | $ 817.3 |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.60 |  | $ 2.27 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.58 |  | $ 2.25 | [8]
Adjustments [Member] | ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3.2) |  | $ 1.7 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  | (0.2) |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7.6) |  | (12.4) |
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7.2) |  | (12.6) |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  | 14.3 |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56.4) |  | 5.3 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60.4 |  | $ 9.0 |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.17 |  | $ 0.03 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.17 |  | $ 0.02 | [8]
[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").
[3] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[4] | As a result of the Tax Act, the effective income tax rate for the three months ended February 28, 2018 was significantly impacted by certain one-time net tax benefits. Refer to Note K of this Item 8 for further details.
[5] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[6] | 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)."
[7] | Each quarter is a discrete period and the sum of the four quarters' basic and diluted earnings per share amounts may not equal the full year amount.
[8] | Diluted earnings per share amounts may not add across by +/- $0.01 due to rounding.

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