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Description of Business, Basis of Presentation, and Significant Accounting Policies (Schedule of Recast of Selected Consolidated Balance Sheet) (Details) - USD ($) $ in Millions | May 31, 2019 | May 31, 2018
--- | --- | ---
Assets |  |  |  |
Accounts receivable, net of allowance for doubtful accounts |  | $ 420.5 | $ 374.6 | [1]
PEO unbilled receivables, net of advance collections |  | 406.3 | 117.8 | [1],[2]
Prepaid expenses and other current assets |  | 233.9 | 224.0 | [1]
Long-term deferred costs |  | 366.3 | 361.0 | [1],[3]
Liabilities and stockholders' equity |  |  |  |
Accounts payable |  | 75.9 | 73.7 | [1]
Deferred revenue |  | 40.3 | 34.6 | [1]
Deferred income taxes |  | 223.1 | 154.4 | [1]
Other long-term liabilities |  | 164.7 | 89.1 | [1]
Retained earnings |  | $ 1,409.5 | 1,262.6 | [1]
As Previously Reported [Member] |  |  |  |
Assets |  |  |  |
Accounts receivable, net of allowance for doubtful accounts |  |  | 413.6 |
PEO unbilled receivables, net of advance collections | [2] |  | 117.8 |
Prepaid expenses and other current assets |  |  | 75.8 |
Long-term deferred costs | [3] |  | 18.5 |
Liabilities and stockholders' equity |  |  |  |
Accounts payable |  |  | 74.5 |
Deferred revenue |  |  | 24.3 |
Deferred income taxes |  |  | 48.8 |
Other long-term liabilities |  |  | 84.8 |
Retained earnings |  |  | 930.3 |
ASU 2014-09 [Member] | Adjustments [Member] |  |  |  |
Assets |  |  |  |
Accounts receivable, net of allowance for doubtful accounts |  |  | (39.0) |
Prepaid expenses and other current assets |  |  | 148.2 |
Long-term deferred costs | [3] |  | 342.5 |
Liabilities and stockholders' equity |  |  |  |
Accounts payable |  |  | (0.8) |
Deferred revenue |  |  | 10.3 |
Deferred income taxes |  |  | 105.6 |
Other long-term liabilities |  |  | 4.3 |
Retained earnings |  |  | $ 332.3 |
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606 and to provide further detail related to certain professional employer organization ("PEO") balances.
[2] | Amounts were previously reported as a component of accounts receivable, net of allowance for doubtful accounts included in the Company's fiscal 2018 Form 10-K. PEO unbilled receivables, net of advance collections are separately presented on the Consolidated Balance Sheets contained in this Form 10-K.
[3] | Amounts were previously reported as a component of other long-term assets on the Consolidated Balance Sheets included in the Company's fiscal 2018 Form 10-K. Long-term deferred costs are separately presented on the Consolidated Balance Sheets contained in this Form 10-K.

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