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Debt - Debt Obligations (Details) - USD ($)
Sep. 30, 2025
Mar. 31, 2025
Debt Instrument [Line Items]    
Long-term debt $ 5,406,000,000 $ 5,663,000,000
Less: Debt discount (12,700,000) (13,100,000)
Less: Debt issuance costs (17,400,000) (19,500,000)
Net long-term debt including current maturities 5,375,900,000 5,630,400,000
Less: Current maturities 0 0
Net long-term debt 5,375,900,000 5,630,400,000
Senior Indebtedness    
Debt Instrument [Line Items]    
Long-term debt $ 4,118,000,000 4,375,000,000
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 (2,700,000) (3,300,000)
Less: Debt issuance costs $ (1,400,000) (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 (3,800,000) (4,300,000)
Less: Debt issuance costs $ (1,600,000) (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 (3,700,000) (4,100,000)
Less: Debt issuance costs (1,600,000) (1,700,000)
Commercial Paper    
Debt Instrument [Line Items]    
Long-term debt 1,118,000,000 175,000,000.0
Less: Debt discount (2,500,000) (100,000)
Convertible debt    
Debt Instrument [Line Items]    
Long-term debt $ 1,288,000,000 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 $ 38,000,000.0 38,000,000.0
Less: Debt issuance costs $ (100,000) (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 (12,700,000) (14,000,000.0)
Line of credit | Amended and Restated Credit Agreement | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0