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Business Combinations (Narrative) (Details) $ in Millions |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 20, 2018 USD ($) | Feb. 28, 2018 USD ($) | Aug. 18, 2017 USD ($) state | Nov. 30, 2018 USD ($) | Nov. 23, 2018 state item | May 31, 2018 USD ($) | [1]
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 810.6 |  | $ 814.0
Oasis Outsourcing Group Holdings, L.P. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition agreement date |  |  |  | Nov. 23, 2018 |  |
Effective acquisition date |  |  |  | Dec. 20, 2018 |  |
Number of states | state |  |  |  |  | 50 |
Oasis Outsourcing Group Holdings, L.P. [Member] | Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 1,000.0 |  |  |  |  |
Cash on hand portion of purchase price | 400.0 |  |  |  |  |
Credit facility portion of purchase price | 800.0 |  |  |  |  |
Cash acquired | $ 200.0 |  |  |  |  |
Oasis Outsourcing Group Holdings, L.P. [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of clients | item |  |  |  |  | 8,400 |
Lessor Group [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Effective acquisition date |  |  |  | Feb. 28, 2018 |  |
Purchase price |  | $ 162.5 |  |  |  |
Cash acquired |  | 13.4 |  |  |  |
Goodwill |  | $ 111.5 |  |  |  |
HR Outsourcing Holdings, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Effective acquisition date |  |  |  | Aug. 18, 2017 |  |
Purchase price |  |  | $ 75.4 |  |  |
Cash portion of purchase price |  |  | 42.2 |  |  |
Common stock issued portion of purchase price |  |  | 33.2 |  |  |
Goodwill |  |  | $ 51.1 |  |  |
HR Outsourcing Holdings, Inc. [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of states | state |  |  | 35 |  |  |
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.

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