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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Components of intangible assets, at cost |  |
Client lists | $ 240.9 | $ 231.0
Other intangible assets | 2.6 | 2.4
Total intangible assets, gross | 243.5 | 233.4
Less: Accumulated amortization | 202.9 | 188.2
Intangible assets, net of accumulated amortization | 40.6 | 45.2
Estimated future amortization expense relating to intangible assets |  |
Fiscal year ending May 31, 2015 | 13.4 |
Fiscal year ending May 31, 2016 | 9.9 |
Fiscal year ending May 31, 2017 | 7.3 |
Fiscal year ending May 31, 2018 | 4.9 |
Fiscal year ending May 31, 2019 | $ 2.9 |

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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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