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Acquisitions (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) | Sep. 30, 2018 item | Jun. 30, 2018 item | Mar. 31, 2018 item | Sep. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($) item
Acquisitions |  |  |  |  |  |
Total purchase price |  |  |  |  | $ 94.0 | $ 9.4
Number of acquisitions | item |  | 2 | 3 | 2 |  | 4
Number of acquisitions reported as separate operating location | item |  | 1 |  |  |  |
Notes to former owners |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  | 6 |
BCH |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Total purchase price | $ 121.3 |  |  |  |  |
Amount allocated to goodwill and identifiable 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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