XML 68 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Outstanding performance and surety bonds $ 209.6    
Non-refundable deposits 61.1    
Remaining purchase price of land 455.4    
Project construction commitment      
Loss Contingencies [Line Items]      
Other commitment 181.0    
Accrued Expenses      
Loss Contingencies [Line Items]      
Lease liability $ 15.9 $ 15.6 $ 13.1