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Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) (USD $) In Millions | 12 Months Ended |
--- | --- | ---
May 31, 2011 | May 31, 2010
Components of intangible assets, at cost |  |
Client lists | $ 223.4 | $ 194.4
Other intangible assets | 2.0 | 1.1
Total intangible assets, gross | 225.4 | 195.5
Less: Accumulated amortization | 148.2 | 133.9
Intangible assets, net of accumulated amortization | 77.2 | 61.6
Estimated future amortization expense relating to intangible assets |  |
2012 | 22.9 |
2013 | 17.7 |
2014 | 12.7 |
2015 | 9.0 |
2016 | $ 6.2 |

X
- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of an asset having a finite beneficial life acquired in a business combination or other transaction representing a favorable existing relationship with customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a + Details
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- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) + Details
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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) + Details
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- Definition The amount of amortization expense expected to be recognized during the fifth twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the fourth twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition The amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(3) + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 42, 45 + Details
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets not otherwise specified in the taxonomy having a reasonably expected period of economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a + Details
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