Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Details)

v3.7.0.1
Subsequent Event - Additional Information (Details)
$ in Millions
Jul. 31, 2017
USD ($)
Order
Mar. 31, 2016
USD ($)
Subsequent Event [Line Items]    
Obligation to secure financial assurances   $ 260.8
Subsequent Event    
Subsequent Event [Line Items]    
Obligation to secure financial assurances $ 260.8  
Number of supplemental bonding order | Order 4