| **Consolidated Statements of Changes in Equity - USD ($) $ in Millions**      | Total     | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) |
|-------------------------------------------------------------------------------|-----------|--------------|-------------------|-----------------------------------------------|
| Stockholders' Equity, beginning balance at Oct. 31, 2013                      | $ 1,188.6 | $ 561.6      | $ 627.2           | $ (0.2)                                       |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                |      |         |              |                                          |
| Net income                                                                    | 143.8     |         | 143.8             |                                          |
| Other comprehensive income (loss), net of tax                                 | 0.0       |         |              | 0.0                                           |
| Common stock issuances, including dividend reinvestment and employee benefits | 75.2      | 75.2         |              |                                          |
| Expenses from Issuance of Common Stock                                        | 0.0       | 0.0          |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                                | 0.2       |         | 0.2               |                                          |
| Common stock dividends                                                        | (99.2)    |         | (99.2)            |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2014                         | 1,308.6   | 636.8        | 672.0             | (0.2)                                         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                |      |         |              |                                          |
| Net income                                                                    | 137.0     |         | 137.0             |                                          |
| Other comprehensive income (loss), net of tax                                 | (0.6)     |         |              | (0.6)                                         |
| Common stock issuances, including dividend reinvestment and employee benefits | 85.0      | 85.0         |              |                                          |
| Expenses from Issuance of Common Stock                                        | (0.4)     | (0.4)        |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                                | 0.1       |         | 0.1               |                                          |
| Common stock dividends                                                        | (103.4)   |         | (103.4)           |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2015                         | 1,426.3   | 721.4        | 705.7             | (0.8)                                         |
| **Income Loss Hedging Activities Of Equity Method Investments [Abstract]**    |      |         |              |                                          |
| Hedging activities of equity method investments                               | (0.8)     |         |              |                                          |
| Net income                                                                    | 193.2     |         | 193.2             |                                          |
| Other comprehensive income (loss), net of tax                                 | 0.6       |         |              | 0.6                                           |
| Common stock issuances, including dividend reinvestment and employee benefits | 138.5     | 138.5        |              |                                          |
| Expenses from Issuance of Common Stock                                        | (0.1)     | (0.1)        |              |                                          |
| Tax Benefit from Dividends Paid on ESOP Shares                                | 0.1       |         | 0.1               |                                          |
| Common stock dividends                                                        | (113.7)   |         | (113.7)           |                                          |
| Stockholders' Equity, ending balance at Oct. 31, 2016                         | 1,644.9   | $ 859.8      | $ 785.3           | $ (0.2)                                       |
| **Income Loss Hedging Activities Of Equity Method Investments [Abstract]**    |      |         |              |                                          |
| Hedging activities of equity method investments                               | $ (0.2)   |         |              |                                          |

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The cost incurred directly with the issuance of an equity security.
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The tax benefit resulting from dividends paid on stock held by an employee stock ownership plan.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax of other comprehensive income (loss) attributable to parent entity.
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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