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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Dec. 08, 2016
Indefinite-Lived Intangible Assets [Line Items]            
Amortization of intangible assets     $ 150,100,000 $ 137,000,000.0 $ 134,500,000  
Estimated amortization expense, year ended March 31, 2026     128,900,000      
Estimated amortization expense, year ended March 31, 2027     117,600,000      
Estimated amortization expense, year ended March 31, 2028     112,200,000      
Estimated amortization expense, year ended March 31, 2029     106,600,000      
Estimated amortization expense, year ended March 31, 2030     100,500,000      
Indefinite-lived intangible assets (excluding goodwill)     $ 0 $ 0    
Impairment of intangible assets, indefinite-lived (excluding goodwill) $ 170,000,000.0          
Trademarks and trade names            
Indefinite-Lived Intangible Assets [Line Items]            
Indefinite-lived intangible assets (excluding goodwill)   $ 80,000,000.0       $ 250,000,000.0
Impairment of intangible assets, indefinite-lived (excluding goodwill)   $ 170,000,000.0