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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
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
Number of consolidated projects under construction 6   6    
Anticipated expenditures relating to completion of construction type contracts $ 337.1   $ 337.1    
Earnest Money Deposits 0.7   0.7    
Operating Lease, Expense 1.0   3.2    
Rental expense   $ 0.9   $ 2.8  
Minimum Rental Commitments, Remainder of 2019 1.4   1.4    
Minimum Rental Commitments, 2020 3.4   3.4    
Minimum Rental Commitments, 2021 3.2   3.2    
Minimum Rental Commitments, 2022 2.9   2.9    
Minimum Rental Commitments, 2023 2.7   2.7    
Minimum Rental Commitments, Thereafter 4.9   4.9    
Less: interest (2.8)   (2.8)    
Operating lease liabilities $ 15.7   $ 15.7    
Maximum [Member] | Partnership Interest [Member]          
Less than joint venture economic interest noted 100.00%   100.00%