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Basis of Presentation and Significant Accounting Policies - Impact of ROU Assets and Lease Liabilities (Details) - USD ($) $ in Millions | Apr. 30, 2020 | Nov. 01, 2019 | Oct. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use assets | $ 158.8 | $ 167.5 |
Current portion of lease liabilities | 36.0 | 36.3 |
Other accrued liabilities | 158.6 | 155.2 | $ 158.2
Long-term lease liabilities | 144.8 | 154.2 |
Other noncurrent liabilities | $ 77.5 | 58.8 | $ 78.8
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use assets |  | 167.5 |
Current portion of lease liabilities |  | 36.3 |
Other accrued liabilities |  | (3.0) |
Long-term lease liabilities |  | 154.2 |
Other noncurrent liabilities |  | $ (20.0) |

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