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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
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