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Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables) | 9 Months Ended
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Feb. 28, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of intangible assets, at cost | The components of intangible assets, at cost, consisted of the following:
In millions | February 28, 2015 |  | May 31, 2014
Client lists | $ | 244.4 |  |  | $ | 240.9 |
Other intangible assets | 3.2 |  |  | 2.6 |
Total intangible assets, gross | 247.6 |  |  | 243.5 |
Less: Accumulated amortization | 212.0 |  |  | 202.9 |
Intangible assets, net of accumulated amortization | $ | 35.6 |  |  | $ | 40.6 |
Estimated future amortization expense relating to intangible assets | As of February 28, 2015, the estimated amortization expense relating to intangible asset balances for the full year fiscal 2015 and the following four fiscal years is as follows:
In millions Fiscal year ending May 31, | Estimated amortization expense
2015 | $ | 14.4 |
2016 | $ | 11.2 |
2017 | $ | 8.1 |
2018 | $ | 5.5 |
2019 | $ | 3.5 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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