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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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