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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 144.5 $ 152.1 $ 112.6
Estimated amortization expense, year ended March 31, 2022 127.2    
Estimated amortization expense, year ended March 31, 2023 118.7    
Estimated amortization expense, year ended March 31, 2024 117.6    
Estimated amortization expense, year ended March 31, 2025 118.3    
Estimated amortization expense, year ended March 31, 2026 $ 115.1