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Acquisitions Acquisitions Narrative (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Business Combination Segment Allocation [Line Items] |  |
Number of Businesses Acquired | 2 | 6
Business Combination, Goodwill and Intangibles Recorded | $ 14.0 | $ 137.0
IAN |  |
Business Combination Segment Allocation [Line Items] |  |
Number of Businesses Acquired | 1 | 4
CMG |  |
Business Combination Segment Allocation [Line Items] |  |
Number of Businesses Acquired | 1 | 2

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