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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | Aug. 31, 2014 | May 31, 2014
--- | --- | ---
Components of intangible assets, at cost |  |
Client lists | $ 245.8 | $ 240.9
Other intangible assets | 3.5 | 2.6
Total intangible assets, gross | 249.3 | 243.5
Less: Accumulated amortization | 206.7 | 202.9
Intangible assets, net of accumulated amortization | 42.6 | 40.6
Estimated future amortization expense relating to intangible assets |  |
Fiscal year ending May 31, 2015 | 14.8 |
Fiscal year ending May 31, 2016 | 11.2 |
Fiscal year ending May 31, 2017 | 8.4 |
Fiscal year ending May 31, 2018 | 5.6 |
Fiscal year ending May 31, 2019 | $ 3.5 |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of an asset comprised of customer information, acquired in a business combination or other transaction, having a finite beneficial 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=26713463&loc=d3e16323-109275 + Details
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