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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 109.0 $ 35.7 $ 1.3
Estimated amortization expense, year ended March 31, 2019 109.1    
Estimated amortization expense, year ended March 31, 2020 109.1    
Estimated amortization expense, year ended March 31, 2021 109.1    
Estimated amortization expense, year ended March 31, 2022 109.1    
Estimated amortization expense, year ended March 31, 2023 $ 109.1