Commitments And Contingencies (Details) $ in Millions	2 Months Ended	12 Months Ended
	Feb. 20, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Current Fiscal Year End Date		--12-31
Lessee, Operating Lease, Liability, Payments, Due 2020		$ 3.4
Lessee, Operating Lease, Liability, Payments, Due 2021		3.2
Lessee, Operating Lease, Liability, Payments, Due 2022		2.9
Lessee, Operating Lease, Liability, Payments, Due 2023		2.7
Lessee, Operating Lease, Liability, Payments, Due 2024		2.8
Lessee, Operating Lease, Liability, Payments, Due Thereafter		2.1
Lessee, Operating Lease, Liability, Undiscounted Excess Amount		$ 2.1
Number of Operating properties Acquired		4	3
Number of consolidated projects under construction		7
Anticipated expenditures relating to completion of construction type contracts		$ 358.6
Earnest Money Deposits		0.9
Operating Lease, Right-of-Use Asset		10.6
Operating Lease, Liability		15.0
Rent expense related to operating lease liabilities		2.9
Variable Lease, Cost		1.4
Cash flows from operating leases		$ 3.1
Operating Lease, Weighted Average Remaining Lease Term		5 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent		4.90%
Rental expense			$ 3.8	$ 4.0
Operating Leases, Future Minimum Payments Due, Next Twelve Months			2.9
Operating Leases, Future Minimum Payments, Due in Two Years			3.0
Operating Leases, Future Minimum Payments, Due in Three Years			3.1
Operating Leases, Future Minimum Payments, Due in Four Years			2.7
Operating Leases, Future Minimum Payments, Due in Five Years			2.6
Operating Leases, Future Minimum Payments, Due Thereafter			$ 4.5
Partnership Interest [Member] | Maximum [Member]
Less than joint venture economic interest noted		100.00%
Subsequent Event [Member]
Increase (Decrease) in Earnest Money Deposits Outstanding	$ 0.2