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Additional Financial Information (Other Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Other current assets |  |
Prepaid expenses and other | $ 45.2 | $ 26.1
Product inventory | 24.1 | 23.9
Tax credits receivable | 175.1 | 145.9
Other current assets | 244.4 | 195.9
Other non-current assets |  |
Prepaid expenses and other | 38.9 | 39.9
Accounts receivable | 289.2 | 313.1
Tax credits receivable | 85.3 | 119.8
Other non-current assets | $ 413.4 | $ 472.8

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