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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) | Feb. 28, 2018 USD ($) | Feb. 28, 2019 USD ($) segment | Feb. 28, 2018 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 31, 2018 USD ($) | Jun. 01, 2016 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs recognized | $ 10.8 | $ 10.3 | $ 33.6 | $ 29.4 |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  |  |  |  |  | $ 1.3 |
Maximum individual health insurance claims liability |  |  |  |  |  |  |  |  | $ 0.3 |  |  |  |
Estimate of Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and restricted cash equivalents | $ 3,000.0 |  | $ 3,000.0 |  |  |  |  |  |  |  |  | $ 1,900.0 |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  | $ 1.0 |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  | $ 0.3 |  |  |  |  |  |  |  |
ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative adjustment to increase stockholder's equity |  |  |  |  |  |  |  |  |  |  |  |  | $ 262.9
Oasis Outsourcing Group Holdings, L.P. [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  | $ 1.0 |  |  |  |  |
HR Outsourcing Holdings, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |
Maximum individual health insurance claims liability |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |
HR Outsourcing Holdings, Inc. [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 0.8 |  |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  |  |  | $ 0.3 |  |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total percentage | 1.00% |  | 1.00% |  |  |  |  |  |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total percentage |  | 1.00% |  | 1.00% |  |  |  |  |  |  |  |  |
Europe [Member] | Long Lived Assets [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total percentage |  |  | 6.00% |  |  |  |  |  |  |  |  | 10.00% |

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