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Business Combinations - Narrative (Details) £ in Millions, $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Mar. 06, 2020 GBP (£) | Mar. 06, 2020 USD ($) | Jun. 12, 2019 USD ($) | Mar. 29, 2019 USD ($)
Customer relationships, contracts and backlog intangible |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets |  |  | 10 years |
Developed technology intangible |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets |  |  | 12 years |
Other intangible assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets |  |  | 9 years |
Wood Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Enterprise value on debt-free, cash-free basis (USD, GBP) | £ 241 | $ 310.9 |  |
Wood Group | Customer relationships, contracts and backlog intangible |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets | 12 years | 12 years |  |
Wood Group | Developed technology intangible |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets | 15 years | 15 years |  |
KeyW |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Outstanding shares acquired (as a percent) |  |  | 100.00% |
Consideration transferred |  |  | $ 902.7 |
Consideration paid in cash |  |  | 604.3 |
Debt assumed |  |  | 298.4 |
Goodwill recognized expected to be deductible for tax purposes |  |  | 136.0 |
Pro forma income tax expense (benefit) |  |  |  | $ 15.7
Short term debt |  |  | $ 298.4 |

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