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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance for Deferred Tax Assets [Member] - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of period $ 46.9 $ 43.4 $ 48.9
Additions charged (benefit) to costs and expenses 86.2 4.5 (1.6)
Additions charged to other accounts [1] 2.8 (1.0) (3.9)
Reclassified as held for sale (45.2) 0.0 0.0
Balance at end of period $ 90.7 $ 46.9 $ 43.4
[1] Foreign currency translation and other adjustments.