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Income Taxes (Components of Pre-Tax Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ (824.1) $ (409.2) $ (244.2)
International 972.8 274.8 210.4
Income (loss) before income taxes $ 148.7 $ (134.4) $ (33.8)