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Commitments And Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Anticipated expenditures relating to completion of construction type contracts $ 199.4  
Earnest Money Deposits 1.0  
Lessee, Operating Lease, Liability, Payments, Due 2022 3.1  
Lessee, Operating Lease, Liability, Payments, Due 2023 3.0  
Lessee, Operating Lease, Liability, Payments, Due 2024 2.8  
Lessee, Operating Lease, Liability, Payments, Due 2025 2.0  
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 $ (1.0)  
Number of consolidated projects under construction 5  
Operating Lease, Right-of-Use Asset $ 6.9 $ 9.2
Operating Lease, Liability 10.0 13.0
Rent expense related to operating lease liabilities 2.9 3.0
Variable Lease, Cost 1.3 1.3
Operating Lease, Expense 4.2 4.3
Cash flows from operating leases $ 2.7 $ 3.3
Operating Lease, Weighted Average Remaining Lease Term 3 years 7 months 6 days 4 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent 4.80% 4.80%
Payments to Employees $ 3.0  
Operating Lease, Liability Other Liabilities Other Liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Partnership Interest [Member] | Maximum [Member]    
Less than joint venture economic interest noted 100.00%