Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2017
Discrete tax items [Line Items]
Effective tax rate (percent)	17.30%	25.30%
Income tax expense (benefit)	$ 26.3	$ 48.2
Possible decrease in unrecognized tax benefits	6.0
Change In Estimated 2018 Foreign Derived Intangible Income
Discrete tax items [Line Items]
Income tax expense (benefit)	$ (7.5)
Effective income tax rate reconciliation, deduction (percent)			(5.00%)

[Line Items] for Discrete tax items [Table]

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.

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