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Fair Value - Financial Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities $ 5,470.0 $ 6,092.0
Impairment of goodwill 0.0 0.0
Impairment of tangible assets 0.0 0.0
Impairment of intangible assets 0.0 0.0
Impairment of long-lived assets 0.0 0.0
Fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities 5,600.0 6,100.0
Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities $ 5,600.0 $ 5,900.0