Acquisitions and Other Investments (Accounting Policy)	3 Months Ended
Acquisitions and Other Investments (Accounting Policy)	Mar. 31, 2013
Business Combinations [Abstract]
Business Combinations Policy	Allocations of purchase prices for acquisitions are based on estimates of the fair value of consideration paid and of the net assets acquired and are subject to adjustment upon finalization of these fair value estimates. In December 2012, the Company acquired certain businesses, as discussed below and in Note 3 - Acquisitions and Other Investments of the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2012. As of March 31, 2013, the purchase prices, including the estimated fair value of contingent consideration and the related purchase price allocations for these acquisitions were preliminary. During the three months ended March 31, 2013, the Company revised its preliminary allocations for certain of these acquisitions based on new information about the facts and circumstances existing as of the respective dates of such acquisitions, and, for purchase price adjustments, based on the final net assets and net working capital of the businesses acquired, as prescribed in the relevant purchase agreements. These adjustments resulted in the recognition of, or adjusted the fair values of, certain assets acquired and liabilities assumed, which resulted in the revision of comparative prior period financial information. The effect of measurement period adjustments on the allocations of purchase price for the respective acquisitions is as if the adjustments had been taken into account as of the dates of such acquisitions. All changes that do not qualify as measurement period adjustments are included in current period earnings.

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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