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Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 15, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 13 years |  |
Customer relationships |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 13 years |  |
Unpatented technology |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 11 years |  |
Trademarks and trade names |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 14 years |  |
Harsco Corporation’s Air-X-Changers |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 11 years |  |
Finite lived intangible assets acquired |  | $ 248.6 | $ 248.6 | $ 254.5 |
Indefinite-lived intangible assets: |  |  |  |  |
Trademarks |  | 55.8 | 55.8 | 55.5 |
Total identifiable intangible assets acquired |  | 304.4 | $ 304.4 | 310.0 |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | (5.6) |  |  |
Harsco Corporation’s Air-X-Changers | Total identifiable intangible assets acquired |  |  |  |  |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | (5.6) |  |  |
Harsco Corporation’s Air-X-Changers | Trademarks |  |  |  |  |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | 0.3 |  |  |
Harsco Corporation’s Air-X-Changers | Total finite-lived intangible assets acquired |  |  |  |  |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | (5.9) |  |  |
Harsco Corporation’s Air-X-Changers | Customer relationships |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 12 years |  |
Finite lived intangible assets acquired |  | 180.7 | $ 180.7 | 179.1 |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | 1.6 |  |  |
Harsco Corporation’s Air-X-Changers | Developed technology |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 10 years |  |
Finite lived intangible assets acquired |  | 46.7 | $ 46.7 | 47.0 |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | (0.3) |  |  |
Harsco Corporation’s Air-X-Changers | Backlog |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 1 year |  |
Finite lived intangible assets acquired |  | 19.8 | $ 19.8 | 27.3 |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | (7.5) |  |  |
Harsco Corporation’s Air-X-Changers | Non-compete agreements |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life |  |  | 4 years |  |
Finite lived intangible assets acquired |  | 1.4 | $ 1.4 | $ 1.1 |
Adjustments |  |  |  |  |
Identifiable intangible assets |  | 0.3 |  |  |
VRV |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life | 9 years |  |  |  |
Finite lived intangible assets acquired |  | 41.2 | 41.2 |  | $ 66.6
Indefinite-lived intangible assets: |  |  |  |  |
Total identifiable intangible assets acquired |  | 41.2 | 41.2 |  | 66.6
Adjustments |  |  |  |  |
Identifiable intangible assets |  |  | (25.4) |  |
VRV | Customer relationships |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life | 12 years |  |  |  |
Finite lived intangible assets acquired |  | 14.5 | 14.5 |  | 28.1
Adjustments |  |  |  |  |
Identifiable intangible assets |  |  | (13.6) |  |
VRV | Unpatented technology |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life | 12 years |  |  |  |
Finite lived intangible assets acquired |  | 22.2 | 22.2 |  | 15.9
Adjustments |  |  |  |  |
Identifiable intangible assets |  |  | 6.3 |  |
VRV | Other Identifiable intangible assets |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life | 4 years |  |  |  |
Finite lived intangible assets acquired |  | 0.5 | 0.5 |  | 11.8
Adjustments |  |  |  |  |
Identifiable intangible assets |  |  | (11.3) |  |
VRV | Trademarks and trade names |  |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |  |
Weighted-average Estimated Useful Life | 14 years |  |  |  |
Finite lived intangible assets acquired |  | $ 4.0 | 4.0 |  | $ 10.8
Adjustments |  |  |  |  |
Identifiable intangible assets |  |  | $ (6.8) |  |

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