v3.26.1
Debt - Debt Obligations (Details) - USD ($)
Mar. 31, 2026
Feb. 28, 2026
Mar. 31, 2025
May 31, 2024
Debt Instrument [Line Items]        
Long-term debt $ 5,536,900,000   $ 5,663,000,000  
Less: Debt discount (9,300,000)   (13,100,000)  
Less: Debt issuance costs (31,200,000)   (19,500,000)  
Net long-term debt including current maturities 5,496,400,000   5,630,400,000  
Less: Current maturities 0   0  
Net long-term debt 5,496,400,000   5,630,400,000  
Senior Indebtedness        
Debt Instrument [Line Items]        
Long-term debt 3,349,000,000   4,375,000,000  
Commercial Paper        
Debt Instrument [Line Items]        
Long-term debt 349,000,000.0   175,000,000.0  
Less: Debt discount $ (500,000)   (100,000)  
Senior indebtedness | 4.250% 2025 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 4.25%      
Effective Interest Rate 4.60%      
Long-term debt $ 0   1,200,000,000  
Less: Debt discount 0   (1,300,000)  
Less: Debt issuance costs $ 0   (200,000)  
Senior indebtedness | 4.900% 2028 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 4.90%      
Effective Interest Rate 5.10%      
Long-term debt $ 1,000,000,000   1,000,000,000  
Less: Debt discount (2,200,000)   (3,300,000)  
Less: Debt issuance costs $ (1,100,000)   (1,700,000)  
Senior indebtedness | 5.050% 2029 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 5.05%      
Effective Interest Rate 5.20%      
Long-term debt $ 1,000,000,000   1,000,000,000  
Less: Debt discount (3,300,000)   (4,300,000)  
Less: Debt issuance costs $ (1,200,000)   (1,800,000)  
Senior indebtedness | 5.050% 2030 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 5.05%      
Effective Interest Rate 5.20%      
Long-term debt $ 1,000,000,000   1,000,000,000  
Less: Debt discount (3,300,000)   (4,100,000)  
Less: Debt issuance costs (1,400,000)   (1,700,000)  
Convertible debt        
Debt Instrument [Line Items]        
Long-term debt $ 2,187,900,000   1,288,000,000  
Senior subordinated convertible debt | 2017 Senior Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 1.625%      
Effective Interest Rate 1.80%      
Long-term debt $ 37,900,000   38,000,000.0  
Less: Debt issuance costs $ 0   (100,000)  
Senior subordinated convertible debt | 2024 Senior Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 0.75%      
Effective Interest Rate 1.00%      
Long-term debt $ 1,250,000,000   1,250,000,000  
Less: Debt issuance costs $ (11,400,000)   (14,000,000.0) $ (16,500,000)
Senior subordinated convertible debt | 2026 Senior Convertible Debt        
Debt Instrument [Line Items]        
Coupon Interest Rate 0.00%      
Effective Interest Rate 0.50%      
Long-term debt $ 900,000,000.0   0  
Less: Debt issuance costs (16,100,000) $ (16,600,000) 0  
Line of credit | Amended and Restated Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt $ 0   $ 0