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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill |  |  |  |  |
Goodwill |  | $ 3,674.4 | $ 3,608.5 | $ 3,669.2 | [1]
Current year acquisitions |  | 122.0 | 51.0 |  |
Foreign currency and other |  | (56.1) | (111.7) |  |
IAN |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill | [1] | 3,043.8 | 3,051.4 | 3,108.5 |
Current year acquisitions |  | 32.7 | 37.8 |  |
Foreign currency and other |  | (40.3) | (94.9) |  |
CMG |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill | [1] | 630.6 | 557.1 | $ 560.7 |
Current year acquisitions |  | 89.3 | 13.2 |  |
Foreign currency and other |  | $ (15.8) | $ (16.8) |  |
[1] | For all periods presented, we have not recorded a goodwill impairment charge.

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