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Accounts and Other Receivables - Components of Accounts and Other Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Receivables [Abstract]        
Trade receivables $ 296.7 $ 268.4    
Income taxes receivable 25.4 84.7    
Other receivables and advances 17.2 14.6    
Provision for doubtful trade receivables (6.1) (4.4) $ (2.9) $ (1.3)
Total accounts and other receivables $ 333.2 $ 363.3