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Debt (Narrative - Senior Notes) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]    
Principal amount of debt outstanding $ 2,741.9 $ 2,927.5
5.875% Senior Notes    
Debt Instrument [Line Items]    
Discount Rate, Basis Spread on Treasury Rate 0.50%  
5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Coupon rate 5.875%  
Principal amount of debt outstanding $ 518.7 520.0
6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Coupon rate 6.375%  
Principal amount of debt outstanding $ 545.6 $ 550.0
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%  
5.875% Senior Notes and 6.375% Senior Notes    
Debt Instrument [Line Items]    
Net Loss, Amount Free of Restrictions $ 206.4  
Accumulated Deficit, Amount Free of Restrictions $ 16.9  
Debt instrument, redemption, period one | 5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 104.406%  
Debt instrument, redemption, period one | 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 100.00%  
Debt instrument, redemption, period two | 5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 102.938%  
Debt instrument, redemption, period two | 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 103.188%  
Debt instrument, redemption, period three | 5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 101.439%  
Debt instrument, redemption, period three | 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 101.594%  
Debt instrument, redemption, period four | 5.875% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 100.00%  
Debt instrument, redemption, period four | 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 100.00%  
Change in Control | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 101.00%  
Certain Asset Disposition | 5.875% Senior Notes and 6.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument redemption price percentage 100.00%