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v3.7.0.1

Backlog (Details) - Construction $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Backlog | $ 503.5 | $ 380.8 | $ 357.0
Contracts or Purchase Orders |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Backlog | 441.1 | 252.7 | 305.3
Letters of Intent |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Backlog | 62.4 | $ 128.1 | $ 51.7
Five Contracts, Letters of Intent, Notices to Proceed or Purchase Orders |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Backlog | $ 296.4 |  |
Backlog percentage | 58.90% |  |
Number of contracts attributable to backlog | contract | 5 |  |

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