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Business Acquisitions, Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2017
Business Acquisitions, Goodwill and Intangible Assets |
Schedule of acquisition and integration expenses |
|  | Three months ended Dec 31, |
|  | 2017 |  | 2016 |
|  | (in millions) |
Severance and personnel costs |  | $ | — |  | $ | 11.5 |
Professional service, real estate-related, and other expenses |  | — |  | 3.9 |
Total |  | $ | — |  | $ | 15.4 |
Schedule of changes in the carrying value of goodwill by reportable segment |
|  | September 30, 2017 |  | Acquisitions |  | Measurement Period Adjustments |  | Foreign Exchange Impact |  | December 31, 2017 |
|  | (in millions) |
Design and Consulting Services |  | $ | 3,218.9 |  | $ | — |  | $ | — |  | $ | 4.3 |  | $ | 3,223.2 |
Construction Services |  | 1,049.9 |  | — |  | (2.3 | ) | (1.6 | ) | 1,046.0 |
Management Services |  | 1,724.1 |  | — |  | — |  | 3.7 |  | 1,727.8 |
Total |  | $ | 5,992.9 |  | $ | — |  | $ | (2.3 | ) | $ | 6.4 |  | $ | 5,997.0 |
Schedule of finite-lived intangible assets by major class |
|  | December 31, 2017 |  | September 30, 2017 |  |  |
|  | Gross Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Gross Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Amortization Period |
|  | (in millions) |  | (years) |
Backlog and customer relationships |  | $ | 1,304.0 |  | $ | (893.7 | ) | $ | 410.3 |  | $ | 1,283.6 |  | $ | (870.2 | ) | $ | 413.4 |  | 1 – 11 |
Trademark / tradename |  | 18.3 |  | (16.8 | ) | 1.5 |  | 18.3 |  | (16.6 | ) | 1.7 |  | 0.3 - 2 |
Total |  | $ | 1,322.3 |  | $ | (910.5 | ) | $ | 411.8 |  | $ | 1,301.9 |  | $ | (886.8 | ) | $ | 415.1 |  |  |
Schedule of estimated future amortization expense of intangible assets |
Fiscal Year |  | (in millions) |
2018 (nine months remaining) |  | $ | 71.0 |
2019 |  | 87.8 |
2020 |  | 73.7 |
2021 |  | 62.8 |
2022 |  | 49.7 |
Thereafter |  | 66.8 |
Total |  | $ | 411.8 |

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