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Debt (Narrative - Senior Notes) (Details)
$ in Millions
6 Months Ended
Sep. 30, 2023
USD ($)
Senior Credit Facilities And Senior Notes  
Debt Instrument [Line Items]  
Net loss, amount free of restrictions $ 959.4
Accumulated deficit, amount free of restrictions $ 3,467.5
5.500% Senior Notes  
Debt Instrument [Line Items]  
Basis spread on treasury rate 0.50%
5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Coupon rate 5.50%
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%
Debt instrument, redemption period one | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Debt instrument, redemption price, percentage of principal amount that may be redeemed, certain equity offerings 40.00%
Debt instrument, redemption price, certain equity offerings, percentage 105.50%
Debt instrument, redemption, period two | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 102.75%
Debt instrument, redemption, period three | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 101.375%
Debt instrument, redemption, period four | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%
Change in Control | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 101.00%
Certain Asset Disposition | 5.500% Senior Notes | Senior Notes  
Debt Instrument [Line Items]  
Debt instrument redemption price percentage 100.00%