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Business Acquisitions, Goodwill and Intangible Assets - URS Acquisition (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 17, 2014 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) item
Business acquisition |  |  |  |
Number of acquisition | item |  | 1 |  | 2
Total consideration |  | $ 5.6 |  | $ 164.4
Amortization of intangible assets |  | 23.7 | $ 25.4 |
URS |  |  |  |
Business acquisition |  |  |  |
Ownership acquired (in percent) | 100.00% |  |  |
Total consideration | $ 2,300.0 |  |  |
Consideration paid by issuing stock | 1,600.0 |  |  |
Senior notes assumed, net of Company repayments | 400.0 |  |  |
Repayment of acquiree term loan as part of consideration | 600.0 |  |  |
Repayment of acquiree line of credit as part of consideration | 100.0 |  |  |
Accrued expenses and other current liabilities | 240.0 |  |  |
Amortization of intangible assets of acquiree for the period |  | 18.2 | 20.9 |
Fair value adjustment of joint ventures |  | 1.9 | 2.0 |
Fair value adjustment of noncontrolling interests |  | (2.1) | (2.1) |
Fair value of margin liability | $ 149.1 |  |  |
Carrying value margin fair value liability |  | 7.5 |  | $ 8.6
Margin liability recognition period ( in years) | 2 years |  |  |
Revenue and related income from operations related to margin fair value liability |  | $ 1.1 | $ 1.6 |
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 |  |  |

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- Definition This element represents the amount of amortization of intangible assets of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition Amount of billings in excess of costs on uncompleted contracts assumed at the acquisition date. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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