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Acquisitions - Other Acquisitions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 item | Mar. 31, 2019 item | Sep. 30, 2018 item | Jun. 30, 2018 item | Mar. 31, 2018 item | Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) item
Acquisitions |  |  |  |  |  |  |  |  |
Number of acquisitions | item | 1 | 1 | 2 | 3 | 2 |  |  |  | 4
Total purchase price |  |  |  |  |  |  | $ 2.6 | $ 96.4 | $ 9.4
Number of acquisitions reported as separate operating location | item |  |  | 1 |  |  |  |  |  |
BCH |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ 121.3 |  |  |
Amount allocated to goodwill and intangible assets for acquisitions |  |  |  |  |  | 97.0 |  |  |
Purchase price paid in cash |  |  |  |  |  | 95.4 |  |  |
Promissory note payable |  |  |  |  |  | 14.3 |  |  |
Contingent earn-out obligation |  |  |  |  |  | $ 11.6 |  |  |

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