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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2019 USD ($) | Aug. 31, 2019 USD ($) segment | Aug. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) | May 31, 2020 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 ($) | May 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by investing activities |  | $ 544.7 | $ 156.0 | [1] |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  | 1,361.5 | 1,619.9 | [1] |  |  |  |  |  | $ 935.2 |  |  | $ 2,300.5 | [1]
Cash and cash equivalents |  | 586.4 | 440.1 | [1] |  |  |  |  |  | 673.6 |  |  |  |
Allowance for doubtful accounts |  | 10.6 |  |  |  |  |  |  |  | 7.5 |  |  |  |
Advance collections |  | 4.2 |  |  |  |  |  |  |  | 4.2 |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |
Operating lease, impairment loss |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs recognized |  | 10.5 | 10.9 |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  | 112.8 |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, liability |  | 130.8 |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 1.0 |  |  |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  |  |  | $ 0.3 |  |  |  |  |  |  |
ASU 2016-18 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by investing activities |  |  | (762.5) |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  |  | $ 1,200.0 |  |  |  |  |  |  |  |  |  | $ 1,900.0 |
ASU 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in lease-related assets and liabilities | $ 116.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset | 116.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, liability | 135.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized landlord allowances and lease incentives | $ 18.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Trade Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | 77.2 |  |  |  |  |  |  |  | 94.5 |  |  |  |
Purchased Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ 358.5 |  |  |  |  |  |  |  | 333.5 |  |  |  |
Oasis And HROi [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 1.0 |  |  |  |  |  |  |  |
Oasis Outsourcing Group Holdings, L.P. [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 |  |  |  |  |  |  |  |  | $ 0.3 |  |  | $ 0.5 |  |
HR Outsourcing Holdings, Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  |  | $ 0.8 |  |  |  |  |  |
HR Outsourcing Holdings, Inc. [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  | $ 0.3 |  |  |  |  |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [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 |  | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  |  |
[1] | Amounts have been adjusted to reflect 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).”

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