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Debt - ABL Credit Facility (Details) - Line of Credit - ABL Credit Facility
3 Months Ended 6 Months Ended
Dec. 31, 2016
Jun. 30, 2016
USD ($)
Senior Secured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   $ 1,750,000,000
Mandatory prepayment, percentage of cash proceeds for reinvestment (less than)   100.00%
Mandatory prepayment, cash proceeds reinvestment period   365 days
Mandatory prepayment, available loan commitment (less than)   $ 250,000,000
Percentage of capital stock secured as collateral   65.00%
Maximum payment of dividends (not to exceed)   $ 200,000,000
Remaining Capacity   868,100,000
Availability Under Borrowing Base Limitation   837,900,000
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   350,000,000
Letter of Credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   250,000,000
Remaining Capacity   207,100,000
Letter of credit outstanding   $ 42,900,000
Forecast | Senior Secured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Fixed charge coverage ratio (not less than) 1  
Base Rate | Senior Secured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   2.00%