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Additional Financial Information (Other Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Other current assets    
Prepaid expenses and other $ 69.7 $ 150.6
Product inventory 19.0 19.9
Tax credits receivable 90.3 96.7
Other current assets 179.0 267.2
Other non-current assets    
Prepaid expenses and other 45.6 109.2
Accounts receivable 148.6 176.1
Tax credits receivable 176.6 150.8
Operating lease right-of-use assets 146.3 0.0
Other non-current assets $ 517.1 $ 436.1