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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 142.3 $ 140.2 $ 134.9
Estimated amortization expense, year ended March 31, 2025 138.3    
Estimated amortization expense, year ended March 31, 2026 127.6    
Estimated amortization expense, year ended March 31, 2027 120.6    
Estimated amortization expense, year ended March 31, 2028 115.6    
Estimated amortization expense, year ended March 31, 2029 $ 110.1