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DEBT-Senior Facility (Details)
$ in Millions
Sep. 09, 2016
USD ($)
item
Jun. 30, 2017
USD ($)
Current and long-term debt    
Letters of credit outstanding   $ 6.4
Senior revolving credit facility    
Current and long-term debt    
Current borrowing capacity   650.0
Amount outstanding   153.0
Senior revolving credit facility    
Current and long-term debt    
Maximum borrowing capacity $ 1,500.0  
Current borrowing capacity $ 650.0  
Number of interim unscheduled redeterminations of borrowing base to which the company and lender each have the right | item 1  
Number of consecutive semi-annual redeterminations between which the company and the lenders each have the right to one interim unscheduled redetermination of borrowing base | item 2  
Number of fiscal quarters used to determine certain financial covenants | item 4  
Borrowing capacity available   $ 490.6
Senior revolving credit facility | Minimum    
Current and long-term debt    
Amount outstanding $ 100.0  
Current Ratio 1.00  
Senior revolving credit facility | Maximum    
Current and long-term debt    
Total Net Indebtedness Leverage Ratio initial period 4.75  
Total Net Indebtedness Leverage Ratio on September 30, 2017 4.50  
Total Net Indebtedness Leverage Ratio on March 31, 2019 4.00  
Senior revolving credit facility | ABR - based | Minimum    
Current and long-term debt    
Applicable margin (as a percent) 1.75%  
Senior revolving credit facility | ABR - based | Maximum    
Current and long-term debt    
Applicable margin (as a percent) 2.75%  
Senior revolving credit facility | LIBOR | Minimum    
Current and long-term debt    
Applicable margin (as a percent) 2.75%  
Senior revolving credit facility | LIBOR | Maximum    
Current and long-term debt    
Applicable margin (as a percent) 3.75%