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Revenue and Contracts in Process - Schedule of Infrastructure Segment Revenue (Details) - Infrastructure
$ in Millions
Sep. 30, 2022
USD ($)
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 1,903.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | DBMG  
Segment Reporting Information [Line Items]  
Remaining performance obligation period 36 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 1,559.7
Remaining performance obligation period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 343.4
Remaining performance obligation period 5 years
Commercial  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 520.1
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 409.7
Remaining performance obligation period 1 year
Commercial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 110.4
Remaining performance obligation period 5 years
Industrial  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 261.9
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 243.4
Remaining performance obligation period 1 year
Industrial | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 18.5
Remaining performance obligation period 5 years
Transportation  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 430.5
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 332.9
Remaining performance obligation period 1 year
Transportation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 97.6
Remaining performance obligation period 5 years
Government  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 13.2
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 13.2
Remaining performance obligation period 1 year
Government | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
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 $ 6.6
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 6.6
Remaining performance obligation period 1 year
Leisure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
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 $ 527.8
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 418.9
Remaining performance obligation period 1 year
Healthcare | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 108.9
Remaining performance obligation period 5 years
Convention  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 140.0
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 132.0
Remaining performance obligation period 1 year
Convention | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 8.0
Remaining performance obligation period 5 years
Other  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 3.0
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01 | Within One Year  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 3.0
Remaining performance obligation period 1 year
Other | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 | Within Five Years  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 0.0
Remaining performance obligation period 5 years