Revenue - Construction Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 383.4	$ 362.5
Net revenue	444.8	449.0
Construction
Disaggregation of Revenue [Line Items]
Revenue	176.5	192.1
Other revenue	0.0	0.0
Net revenue	176.5	192.1
Construction \| Commercial Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	62.8	59.4
Construction \| Convention Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	2.4	28.7
Construction \| Healthcare Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	8.0	8.8
Construction \| Industrial Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	58.9	53.8
Construction \| Transportation
Disaggregation of Revenue [Line Items]
Revenue	16.3	18.1
Construction \| Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	12.1	8.4
Construction \| Leisure
Disaggregation of Revenue [Line Items]
Revenue	$ 16.0	$ 14.9

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No definition available.

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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
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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