Acquisitions (Details) (USD $) In Millions, except Per Share data	9 Months Ended
Sep. 30, 2011	Mar. 31, 2011
Acquisition-date fair value of the total consideration transferred		$ 30.0
Aggregate cash consideration		27.0
Contingent consideration estimated fair value		3.0
Purchase price allocation, accounts receivable		24.1
Purchase price allocation, assumed liabilities		20.7
Purchase price allocation, identifiable intangible assets		6.3
Purchase price allocation, goodwill		15.0
Acquisition-related costs	1.5
Common stock consideration in relation to price protection provision guarantees	$ 6.2
Maximum [Member]
Stock floor prices for common stock price guarantee provisions	$ 69.48
Determination dates for common stock price guarantee provisions	2013
Minimum [Member]
Stock floor prices for common stock price guarantee provisions	$ 28.47
Determination dates for common stock price guarantee provisions	2012

Amount of cash paid in relation to stock floor guarantees.

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Determination dates for common stock price guarantee provisions.

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Maximum per share stock floor price within the remaining restricted stock agreements containing stock price guarantee provisions.

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Minimum per share stock floor price within the remaining restricted stock agreements containing stock price guarantee provisions.

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Amount of cash paid to acquire the entity.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The amount of acquisition cost of a business combination allocated to receivables.

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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.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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