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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Outstanding performance and surety bonds $ 239.0  
Non-refundable deposits 92.1  
Remaining purchase price of land 996.4  
Project construction commitment    
Loss Contingencies [Line Items]    
Other commitment 453.8  
Accrued Expenses    
Loss Contingencies [Line Items]    
Lease liability $ 14.8 $ 14.5