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Segment Information Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financial Data: |  |
Assets | $ 11,499.3 | $ 12,747.2
IAN |  |
Financial Data: |  |
Assets | 10,156.4 | 11,111.2
CMG |  |
Financial Data: |  |
Assets | 1,275.2 | 1,316.5
Corporate and Other |  |
Financial Data: |  |
Assets | $ 67.7 | $ 319.5

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