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Long-Term Debt (Redemptions and Restrictions) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 19, 2016
Sep. 30, 2016
Sep. 30, 2016
Mar. 31, 2016
Debt Instrument [Line Items]        
Unamortized discount (premium) and debt issuance costs, net   $ 22.3 $ 22.3 $ 27.2
2012 ABL Revolver | Revolving Credit Facility        
Debt Instrument [Line Items]        
Term loan repayments   65.0    
Line of credit facility, remaining borrowing capacity   68.2 68.2  
2012 ABL Revolver | Revolving Credit Facility | Other long-term assets        
Debt Instrument [Line Items]        
Unamortized debt costs related to 2012 ABL Revolver   1.1 $ 1.1 1.3
Senior Notes | 2013 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, redemption price, percentage     101.00%  
Unamortized discount (premium) and debt issuance costs, net   5.0 $ 5.0 5.4
Senior Notes | 2016 Senior Notes        
Debt Instrument [Line Items]        
Unamortized discount (premium) and debt issuance costs, net   5.1 5.1 5.4
Term Loans | 2012 Term Loan        
Debt Instrument [Line Items]        
Unamortized discount (premium) and debt issuance costs, net   $ 12.2 $ 12.2 $ 16.4
Debt Instrument, Redemption, Period One | Senior Notes | 2013 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, redemption price, percentage     100.00%  
Redemption price, percentage of principal amount, using proceeds of equity offerings     105.375%  
Debt Instrument, Redemption, Period Two | Senior Notes | 2016 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, redemption price, percentage 100.00%      
Maximum | Debt Instrument, Redemption, Period One | Senior Notes | 2013 Senior Notes        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed     35.00%  
Maximum | Debt Instrument, Redemption, Period Two | Senior Notes | 2016 Senior Notes        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed 40.00%      
Indirect Guarantee of Indebtedness | Senior Notes | 2016 Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, redemption price, percentage 101.00%