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Commitments And Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Anticipated expenditures relating to completion of construction type contracts $ 306.7  
Number of consolidated projects under construction 6  
Earnest Money Deposits $ 1.1  
Lessee, Operating Lease, Liability, Payments, Due 2022 3.3  
Lessee, Operating Lease, Liability, Payments, Due 2023 3.1  
Lessee, Operating Lease, Liability, Payments, Due 2024 2.3  
Lessee, Operating Lease, Liability, Payments, Due 2025 0.4  
Lessee, Operating Lease, Liability, Payments, Due 2026 0.1  
Lessee, Operating Lease, Liability, Payments, Due Thereafter 0.0  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (0.8)  
Operating Lease, Liability 8.4 $ 10.0
Operating Lease, Right-of-Use Asset 6.0 6.9
Rent expense related to operating lease liabilities 2.7 2.9
Variable Lease, Cost 1.3 1.3
Operating Lease, Expense 4.0 4.2
Cash flows from operating leases $ 2.5 $ 2.7
Operating Lease, Weighted Average Remaining Lease Term 2 years 10 months 24 days 3 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent 4.60% 4.80%
Operating Lease, Liability Other Liabilities Other Liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
non-refundable earnest money    
Earnest Money Deposits $ 0.5