Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details)

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DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Debt Instrument [Line Items]        
Long-term Debt $ 2,192,600,000   $ 2,699,400,000  
Long-term Debt, Current Maturities 17,500,000      
LONG-TERM DEBT $ 2,175,100,000   2,699,400,000  
$540 Million 8.25% 2020 First Lien Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 8.25%      
Debt Instrument, Face Amount $ 540,000,000   $ 540,000,000  
Imputed interest rate 9.97%   9.97%  
Debt Instrument, Par Value $ 540,000,000   $ 540,000,000  
Unamortized Debt Issuance Expense (8,000,000)   (10,500,000)  
Debt Instrument, Unamortized Discount (25,700,000)   (32,100,000)  
Long-term Debt $ 506,300,000   497,400,000  
$218.5 Million 8.00% 2020 1.5 Lien Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 8.00%      
Debt Instrument, Face Amount $ 218,500,000.0   218,500,000.0  
Debt Instrument, Par Value 218,500,000 $ 218,500,000    
Unamortized Debt Issuance Expense 0      
Debt Instrument, Unamortized Discount 65,700,000      
Long-term Debt $ 284,200,000      
$544.2 Million 7.75% 2020 Second Lien Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 7.75%      
Debt Instrument, Face Amount $ 544,200,000   $ 544,200,000.0  
Imputed interest rate 15.55%   15.55%  
Debt Instrument, Par Value $ 430,100,000   $ 544,200,000 $ 544,200,000
Unamortized Debt Issuance Expense (5,800,000)   (9,500,000)  
Debt Instrument, Unamortized Discount (85,200,000)   (131,500,000)  
Long-term Debt $ 339,100,000   403,200,000  
$500 Million 3.95% 2018 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.95%      
Debt Instrument, Face Amount $ 500,000,000   $ 500,000,000.0  
Imputed interest rate     6.30%  
Debt Instrument, Par Value     $ 311,200,000  
Unamortized Debt Issuance Expense     (900,000)  
Debt Instrument, Unamortized Discount     (1,200,000)  
Long-term Debt $ 0   309,100,000  
$400 Million 5.90% 2020 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.90%      
Debt Instrument, Face Amount $ 400,000,000   $ 400,000,000  
Imputed interest rate 5.98%   5.98%  
Debt Instrument, Par Value $ 225,600,000   $ 290,800,000  
Unamortized Debt Issuance Expense (600,000)   (1,100,000)  
Debt Instrument, Unamortized Discount (500,000)   (800,000)  
Long-term Debt $ 224,500,000   $ 288,900,000  
$500 Million 4.80% 2020 Senior Notes[Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.80%      
Debt Instrument, Face Amount $ 500,000,000      
Imputed interest rate 4.83%   4.83%  
Debt Instrument, Par Value $ 236,800,000   $ 306,700,000  
Unamortized Debt Issuance Expense (700,000)   (1,100,000)  
Debt Instrument, Unamortized Discount (200,000)   (400,000)  
Long-term Debt $ 235,900,000   305,200,000  
$700 Million 4.875% 2021 Senior Notes[Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.875%      
Debt Instrument, Face Amount $ 700,000,000   $ 700,000,000  
Imputed interest rate 4.89%   4.89%  
Debt Instrument, Par Value $ 309,400,000   $ 412,500,000  
Unamortized Debt Issuance Expense (1,000,000)   (1,700,000)  
Debt Instrument, Unamortized Discount (200,000)   (200,000)  
Long-term Debt $ 308,200,000   $ 410,600,000  
$800 Million 6.25% 2040 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.25%      
Debt Instrument, Face Amount $ 800,000,000      
Imputed interest rate 6.34%   6.34%  
Debt Instrument, Par Value $ 298,400,000   $ 492,800,000  
Unamortized Debt Issuance Expense (2,500,000)   (4,300,000)  
Debt Instrument, Unamortized Discount (3,400,000)   (5,800,000)  
Long-term Debt 292,500,000   482,700,000  
ABL Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Par Value 550,000,000      
Credit facility, amount outstanding 0   0  
Interest Rate Swap [Member]        
Debt Instrument [Line Items]        
Fair Value Adjustment to Interest Rate Hedge $ 1,900,000   $ 2,300,000