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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill |  |  |
Goodwill | $ 4,894.4 | $ 4,875.9 | $ 3,820.4
Current year acquisitions | 2.8 | 1,132.0 |
Foreign currency and other | 15.7 | (76.5) |
IAN |  |  |
Goodwill |  |  |
Goodwill | 4,225.8 | 4,209.3 | 3,161.8
Current year acquisitions | 2.1 | 1,112.0 |
Foreign currency and other | 14.4 | (64.5) |
CMG |  |  |
Goodwill |  |  |
Goodwill | 668.6 | 666.6 | $ 658.6
Current year acquisitions | 0.7 | 20.0 |
Foreign currency and other | $ 1.3 | $ (12.0) |

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