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Acquisitions Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2016 USD ($) business | Sep. 30, 2015 USD ($) business
Number of Businesses Acquired | 9 | 2
Business Combination, Goodwill and Intangibles Recorded | $ | $ 147.9 | $ 14.0
IAN |  |
Number of Businesses Acquired | 3 | 1
CMG |  |
Number of Businesses Acquired | 6 | 1

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