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Business Acquisitions, Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2019
Business Acquisitions, Goodwill and Intangible Assets |
Schedule of changes in the carrying value of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Foreign | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | ​ | Exchange | ​ | September 30,
​ |  | 2018 |  | Disposal |  | Impairment |  | Impact |  | 2019
​ | ​ | (in millions)
Design and Consulting Services | ​ | $ | 3,189.2 | ​ | $ | (5.8) | ​ | $ | — | ​ | $ | (22.2) | ​ | $ | 3,161.2
Construction Services | ​ | ​ | 1,008.9 | ​ | ​ | — | ​ | ​ | (588.0) | ​ | ​ | (3.3) | ​ | ​ | 417.6
Management Services | ​ |  | 1,723.0 | ​ |  | (12.5) | ​ |  | — | ​ |  | (14.0) | ​ |  | 1,696.5
Total | ​ | $ | 5,921.1 | ​ | $ | (18.3) | ​ | $ | (588.0) | ​ | $ | (39.5) | ​ | $ | 5,275.3
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal Year 2018
​ | ​ | ​ | ​ | ​ | ​ | Measurement | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | Period | ​ | ​ | ​ | ​ | Exchange | ​ | September 30,
​ |  | 2017 |  | Adjustment |  | Impairment |  | Impact |  | 2018
​ | ​ | (in millions)
Design and Consulting Services | ​ | $ | 3,218.9 | ​ | $ | — | ​ | $ | — | ​ | $ | (29.7) | ​ | $ | 3,189.2
Construction Services | ​ | ​ | 1,049.9 | ​ | ​ | 91.0 | ​ | ​ | (125.4) | ​ | ​ | (6.6) | ​ | ​ | 1,008.9
Management Services | ​ |  | 1,724.1 | ​ |  | — | ​ |  | — | ​ |  | (1.1) | ​ |  | 1,723.0
Total | ​ | $ | 5,992.9 | ​ | $ | 91.0 | ​ | $ | (125.4) | ​ | $ | (37.4) | ​ | $ | 5,921.1
​
Schedule of finite-lived intangible assets by major class | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019 | ​ | September 30, 2018 | ​ | Amortization
​ | ​ | Gross | ​ | Accumulated | ​ | Intangible | ​ | Gross | ​ | Accumulated | ​ | Intangible | ​ | Period
​ |  | Amount |  | Amortization |  | Assets, Net |  | Amount |  | Amortization |  | Assets, Net |  | (years)
​ | ​ | (in millions)
Backlog and customer relationships | ​ | $ | 1,284.2 | ​ | $ | (1,051.2) | ​ | $ | 233.0 | ​ | $ | 1,285.1 | ​ | $ | (966.0) | ​ | $ | 319.1 |  | 1 - 11
Trademark / tradename | ​ |  | 18.3 | ​ |  | (18.3) | ​ |  | — | ​ |  | 18.3 | ​ |  | (17.5) | ​ |  | 0.8 |  | 0.3 - 2
Total | ​ | $ | 1,302.5 | ​ | $ | (1,069.5) | ​ | $ | 233.0 | ​ | $ | 1,303.4 | ​ | $ | (983.5) | ​ | $ | 319.9 | ​ | ​
​
Schedule of estimated future amortization expense of intangible assets | ​
​ | ​ | ​ | ​
Fiscal Year |  | (in millions)
2020 | ​ | $ | 68.9
2021 | ​ |  | 56.1
2022 | ​ |  | 43.4
2023 | ​ |  | 39.0
2024 | ​ | ​ | 20.2
Thereafter | ​ |  | 5.4
Total | ​ | $ | 233.0

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