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Acquisitions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Business Combinations |  |  |  |  |
Number of completed acquisitions | 11 |  | 12 |  | 22
Business Combination, Recognized Identifiable Goodwill and Liabilities Acquired, Net | $ 97.0 |  | $ 201.0 |  |
Goodwill, Purchase Accounting Adjustments | 0 | [1] | 2.2 | [1] | 133.0
IAN |  |  |  |  |
Business Combinations |  |  |  |  |
Number of completed acquisitions | 9 |  | 8 |  | 18
CMG |  |  |  |  |
Business Combinations |  |  |  |  |
Number of completed acquisitions | 2 |  | 4 |  | 4
Goodwill, Purchase Accounting Adjustments | $ 0 | [1] | $ 0 | [1] |
[1] | For all periods presented we have not recorded a goodwill impairment charge.

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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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