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Acquisitions - Other Acquisitions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) item
Acquisitions |  |  |
Number of acquisitions | item |  |  | 2
Total purchase price |  | $ 41.6 | $ 2.6
Walker |  |  |
Acquisitions |  |  |
Total purchase price | $ 235.4 |  |
Amount allocated to goodwill and intangible assets for acquisitions | 187.0 |  |
Purchase price paid in cash | 178.0 |  |
Promissory note payable | 25.0 |  |
Advance to former owners | 20.5 |  |
Contingent earn-out obligation | 19.5 |  |
Tax equalization payment | 0.2 |  |
Working capital adjustment | $ 7.8 |  |

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