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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 112.6 $ 109.0 $ 35.7
Estimated amortization expense, year ended March 31, 2020 113.3    
Estimated amortization expense, year ended March 31, 2021 113.3    
Estimated amortization expense, year ended March 31, 2022 113.3    
Estimated amortization expense, year ended March 31, 2023 113.3    
Estimated amortization expense, year ended March 31, 2024 $ 112.7