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Debt (Narrative - Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2024
May 08, 2024
Mar. 31, 2024
Debt Instrument [Line Items]      
Total corporate debt $ 2,219.5   $ 2,508.5
Senior Credit Facilities And Senior Notes      
Debt Instrument [Line Items]      
Net loss, amount free of restrictions (63.1)    
Accumulated deficit, amount free of restrictions $ 3,242.7    
5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Coupon rate 5.50%    
Total corporate debt $ 715.0   $ 715.0
New 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Coupon rate 5.50% 5.50%  
Total corporate debt $ 389.9    
Debt instrument, redemption period one | 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 102.75%    
Debt instrument, redemption period one | New 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 103.00%    
Debt instrument, redemption, period two | 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.375%    
Debt instrument, redemption, period two | New 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 102.00%    
Debt instrument, redemption, period three | 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
Debt instrument, redemption, period three | New 5.500% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.00%    
Debt instrument, redemption, period four | New 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%