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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($) $ in Millions | Feb. 28, 2018 | May 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Total intangible assets, gross |  | $ 314.1 | $ 298.9
Less: Accumulated amortization |  | 209.0 | 241.3
Intangible assets, net of accumulated amortization |  | 105.1 | 57.6
Client Lists [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total intangible assets, gross | [1] | 308.4 | 293.5
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total intangible assets, gross |  | $ 5.7 | $ 5.4
[1] | Client lists include current estimates of amounts acquired from Lessor as of February 28, 2018. Refer to Note C for further details.

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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