Revenue - Construction Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 439.9	$ 455.0	$ 844.8	$ 870.5
Net revenue	518.6	496.8	1,010.0	950.5
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	439.9	455.0	844.8	870.5
Operating Segments \| Construction
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	195.5	176.9	387.6	335.9
Other revenue	0.2	0.0	0.2	0.0
Net revenue	195.7	176.9	387.8	335.9
Operating Segments \| Construction \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	52.9	67.9	112.3	137.5
Operating Segments \| Construction \| Convention
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	28.4	22.2	57.1	53.8
Operating Segments \| Construction \| Healthcare
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	13.6	29.2	22.4	57.1
Operating Segments \| Construction \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	62.7	28.3	116.5	36.1
Operating Segments \| Construction \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16.3	8.2	34.4	13.4
Operating Segments \| Construction \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 21.6	$ 21.1	$ 44.9	$ 38.0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of revenue that is not accounted for under Topic 606.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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