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Employee Benefits - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019
Other changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |
Net (gain) loss | $ (24.4) | $ 20.8 | $ 34.2
Amortizations of net gain | (5.4) | (4.0) | (0.8)
Total recognized in other comprehensive (income) loss | (29.8) | 16.8 | 33.4
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ (15.2) | $ 29.0 | $ 40.6

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