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Business Combinations (Details) (USD $) In Millions, unless otherwise specified | May 31, 2011 | Feb. 08, 2011 Sure Payroll Inc [Member] | May 03, 2011 E Plan Services Inc [Member]
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Business Acquisition [Line Items] |  |  |
Business Acquisitions |  | $ 114.9 | $ 15.2
Business Acquisitions, goodwill |  | $ 84.6 | $ 7.5
Business Combinations (Textuals) [Abstract] |  |  |
Number of businesses acquired by company | 2 |  |

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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d + Details
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- Definition Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 53 -Subparagraph d + Details
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