Revenue - Schedule of Construction Segment Revenue (Details) - Infrastructure $ in Millions	Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 1,624.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 987.0
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 637.4
Remaining performance obligation period	5 years
Commercial
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 1,200.7
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 580.5
Remaining performance obligation period	1 year
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 620.2
Remaining performance obligation period	5 years
Industrial
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 201.3
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 201.3
Remaining performance obligation period	1 year
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years
Transportation
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 58.7
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 41.5
Remaining performance obligation period	1 year
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 17.2
Remaining performance obligation period	5 years
Government
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 47.3
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 47.3
Remaining performance obligation period	1 year
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years
Leisure
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 7.0
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 7.0
Remaining performance obligation period	1 year
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years
Healthcare
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 51.1
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 51.1
Remaining performance obligation period	1 year
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years
Convention
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 52.7
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 52.7
Remaining performance obligation period	1 year
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years
Other
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 5.6
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period One
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 5.6
Remaining performance obligation period	1 year
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Revenue, Remaining Performance Obligation, Period Two
Segment Reporting Information [Line Items]
Remaining performance obligations	$ 0.0
Remaining performance obligation period	5 years