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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |  |
Goodwill | $ 4,875.9 | $ 3,820.4 | $ 3,674.4
Current year acquisitions | 1,132.0 | 55.1 |
Foreign currency and other | (76.5) | 90.9 |
IAN |  |  |
Goodwill |  |  |
Goodwill | 3,099.7 | 3,161.8 | 3,043.8
Current year acquisitions | 1.2 | 39.6 |
Foreign currency and other | (63.3) | 78.4 |
CMG |  |  |
Goodwill |  |  |
Goodwill | 666.6 | 658.6 | 630.6
Current year acquisitions | 20.0 | 15.5 |
Foreign currency and other | (12.0) | 12.5 |
Corporate and Other |  |  |
Goodwill |  |  |
Goodwill | 1,109.6 | 0.0 | $ 0.0
Current year acquisitions | 1,110.8 | 0.0 |
Foreign currency and other | $ (1.2) | $ 0.0 |

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