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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Nov. 30, 2015 USD ($) | Nov. 30, 2016 USD ($) segment $ / shares | Nov. 30, 2015 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
State of incorporation |  |  | Delaware |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |
Allowance for doubtful accounts | $ 6.0 |  | $ 6.0 |  | $ 4.2 |
Accounts receivable, net of allowance for doubtful accounts | 528.9 |  | 528.9 |  | 408.6 |
Maximum individual workers' compensation claims liability |  |  | 1.3 |  | 1.3 |
Maximum individual health insurance claims liability |  |  | 0.3 |  |  | $ 0.3
Stock-based compensation costs recognized | 8.5 | $ 8.7 | 17.6 | $ 17.5 |  |
Excess tax benefit in income tax expense |  |  | $ 14.1 |  |  |
Diluted earnings per share increase | $ / shares |  |  | $ 0.04 |  |  |
Trade Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | 295.0 |  | $ 295.0 |  | 221.6 |
Purchased Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 233.9 |  | $ 233.9 |  | $ 187.0 |
Germany [Member] | Total Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of total revenue less than one percent |  |  | 1.00% | 1.00% |  |

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