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Business Acquisitions, Goodwill and Intangible Assets - URS Acquisition (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 17, 2014 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($)
Business acquisition |  |  |  |
Number of acquisitions | item |  | 1 | 2 |
Total consideration |  | $ 5.6 | $ 164.4 |
Amortization of Intangible Assets |  | 96.7 | 102.7 | $ 202.4
URS |  |  |  |
Business acquisition |  |  |  |
Estimated Legal settlements and uninsured legal damages | $ 240.0 |  |  |
Amortization of Intangible Assets |  | 7.1 | 9.4 |
Margin fair value liability |  | 20.6 | 8.6 |
Income from operations related to margin fair value liability |  | 21.1 | 6.3 |
URS | Customer relationships, contracts and backlog |  |  |  |
Business acquisition |  |  |  |
Acquired backlog and customer relationship assets | $ 973.8 |  |  |
URS | Customer relationships, contracts and backlog | Minimum |  |  |  |
Business acquisition |  |  |  |
Useful life (in years) | 1 year |  |  |
URS | Customer relationships, contracts and backlog | Maximum |  |  |  |
Business acquisition |  |  |  |
Useful life (in years) | 11 years |  |  |
URS | Customer relationships, contracts and backlog | Weighted Average |  |  |  |
Business acquisition |  |  |  |
Useful life (in years) | 3 years |  |  |
URS | Cost of revenue |  |  |  |
Business acquisition |  |  |  |
Amortization of Intangible Assets |  | 68.4 | 83.6 |
URS | Non-Controlling Interests |  |  |  |
Business acquisition |  |  |  |
Amortization of Intangible Assets |  | $ (8.5) | $ (8.5) |

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