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Acquisitions Acquisitions Narrative (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Business Acquisition [Line Items] |  |
Number of Businesses Acquired | 4 | 8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 90.0 | $ 66.0
IAN |  |
Business Acquisition [Line Items] |  |
Number of Businesses Acquired | 2 | 7
CMG |  |
Business Acquisition [Line Items] |  |
Number of Businesses Acquired | 2 | 1

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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 number of businesses acquired by the entity during the period. + References No definition available. + Details
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