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Acquisitions (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Business Combinations |  |  |  |
Number of Businesses Acquired | 8 |  | 11 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 67.0 |  | $ 205.0 |
Business Acquisition, Cost of Investments | 75.7 |  | 176.7 |
Cash Acquired from Acquisitions | (4.7) |  | (14.6) |
Business Acquisition, Operating Expenses | 1.6 | [1] | 3.2 | [1]
Business Acquisitions, Total Cash Paid | 77.3 | [2] | 179.9 | [2]
Acquisition-related payments | 27.5 |  | 36.1 |
Acquisitions, including deferred payments, net of cash acquired | (48.2) |  | (140.6) |
Current-Year Acquisitions |  |  |  |
Business Combinations |  |  |  |
Business Acquisition, Cost of Investments | 51.9 |  | 154.3 |
Prior-Year Acquisitions |  |  |  |
Business Combinations |  |  |  |
Business Acquisition, Cost of Investments | $ 28.5 |  | $ 37.0 |
IAN |  |  |  |
Business Combinations |  |  |  |
Number of Businesses Acquired | 7 |  | 7 |
CMG |  |  |  |
Business Combinations |  |  |  |
Number of Businesses Acquired | 1 |  | 4 |
[1] | Represents cash payments made that were either in excess of the contractual value or contingent upon the future employment of the former owners of acquired companies.
[2] | Of the total cash paid, $27.5 and $36.1 for the nine months ended September 30, 2013, and 2012, respectively, are classified under the financing section of the unaudited Consolidated Statements of Cash Flows within acquisition-related payments. These amounts relate to increases in our ownership interests in our consolidated subsidiaries, as well as deferred payments for acquisitions that closed on or after January 1, 2009. Of the total cash paid, $48.2 and $140.6 for the nine months ended September 30, 2013, and 2012, respectively, are classified under the investing section of the unaudited Consolidated Statements of Cash Flows within acquisitions, including deferred payments, net of cash acquired. These amounts relate to initial payments for new transactions and deferred payments for acquisitions that closed prior to January 1, 2009.

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- Definition The cash outflow associated with the purchase of noncontrolling interests and purchase price payments related to previous acquisitions + References No definition available. + Details
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- Definition Payments To Acquire Businesses Gross Less Operating Expenses + References No definition available. + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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