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New Accounting Pronouncements - Effects of Adopting ASC 606 on Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Aug. 31, 2019 | Aug. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 561.0 | $ 637.9
Prepayments and other current assets | 79.0 | 32.3
Other accrued liabilities | 175.0 | 164.2
Deferred income taxes | 92.7 | 92.5
Other long-term liabilities | 110.7 | 67.9
Retained earnings | 2,295.8 | $ 1,999.2
Higher (Lower) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 21.4 |
Prepayments and other current assets | 13.9 |
Other accrued liabilities | 35.6 |
Deferred income taxes | (5.3) |
Other long-term liabilities | 22.0 |
Retained earnings | (17.0) |
Without ASC 606 Adoption |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 539.6 |
Prepayments and other current assets | 65.1 |
Other accrued liabilities | 139.4 |
Deferred income taxes | 98.0 |
Other long-term liabilities | 88.7 |
Retained earnings | $ 2,312.8 |

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