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Supplemental Balance Sheet Information Supplemental Balance Sheet Information (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Income tax receivable | $ 196.4 | $ 955.4
Other prepaid expenses and current assets | 477.6 | 507.4
Total prepaid expenses and current assets | $ 674.0 | $ 1,462.8

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