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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 152.1 $ 112.6 $ 109.0
Estimated amortization expense, year ended March 31, 2021 140.9    
Estimated amortization expense, year ended March 31, 2022 132.3    
Estimated amortization expense, year ended March 31, 2023 124.3    
Estimated amortization expense, year ended March 31, 2024 123.3    
Estimated amortization expense, year ended March 31, 2025 $ 123.1