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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill |  |  |  |  |
Goodwill |  | $ 3,608.5 | $ 3,669.2 | $ 3,629.0 | [1]
Current year acquisitions |  | 51.0 | 136.1 |  |
Foreign currency and other |  | (111.7) | (95.9) |  |
IAN |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill | [1] | 3,051.4 | 3,108.5 | 3,097.0 |
Current year acquisitions |  | 37.8 | 95.2 |  |
Foreign currency and other |  | (94.9) | (83.7) |  |
CMG |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill | [1] | 557.1 | 560.7 | $ 532.0 |
Current year acquisitions |  | 13.2 | 40.9 |  |
Foreign currency and other |  | $ (16.8) | $ (12.2) |  |
[1] | For all periods presented, we have not recorded a goodwill impairment charge.

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