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Debt (Narrative - Other Debt Transactions) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Sep. 30, 2024
May 31, 2024
Sep. 30, 2024
May 08, 2024
Sep. 30, 2023
Exchange Notes | Senior Notes          
Debt Instrument [Line Items]          
Coupon rate 5.50%   5.50% 5.50%  
Senior Credit Facilities And Senior Notes          
Debt Instrument [Line Items]          
Amount free of restrictions     $ (240.9)    
Accumulated deficit, amount free of restrictions $ (3,396.4)   $ (3,396.4)    
Term Loan A | Term Loans          
Debt Instrument [Line Items]          
Principal amount of debt prepaid   $ 84.9      
Term Loan B | Term Loans          
Debt Instrument [Line Items]          
Principal amount of debt prepaid $ 355.1 $ 214.1      
5.5% Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, principal amount repurchased         $ 85.0
Debt instrument, amount paid for repurchases         61.4
Coupon rate 5.50%   5.50%    
5.500% Senior Notes One | Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, principal amount repurchased         $ 0.0