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Long-Term Debt (Narrative) (Details) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 1,842,288,000 $ 1,992,952,000
2016 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
2013 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 5.375%  
Revolving Credit Facility | 2012 ABL Revolver    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 75,000,000  
Line of credit facility, additional borrowing capacity $ 89,600,000.0