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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]
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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Business combinations textuals abstract.

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Number of businesses acquired by company.

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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