Acquisitions and Divestitures - Additional Information (Details) $ in Millions				3 Months Ended								12 Months Ended
	Oct. 31, 2019 USD ($)	Jun. 11, 2019 USD ($)	Feb. 11, 2019 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2019 USD ($) subsidiary business	Oct. 31, 2018 USD ($) liquidation Divestiture	Oct. 31, 2017 USD ($) subsidiary business
Business Acquisition [Line Items]
Long-term debt	$ 2,659.0			$ 2,659.0				$ 884.1				$ 2,659.0	$ 884.1
Other long-term assets	90.9			90.9				100.4				90.9	100.4
Net income				69.8	$ 67.5	$ 21.1	$ 35.8	45.5	$ 72.0	$ 51.9	$ 60.1	194.2	$ 229.5	$ 135.1
Number of divestitures | Divestiture													0
Gain on disposal of businesses												$ (3.7)	$ 0.8	$ (1.7)
Notes receivable recorded from sale of business								$ 2.9					2.9
Rigid Industrial Packaging & Services
Business Acquisition [Line Items]
Number of divestitures | business														2
Number of subsidiaries liquidated | subsidiary														2
Number of businesses, nonstrategic | business														1
Loss on disposal														$ 1.7
Proceeds from divestiture and deconsolidation														5.1
Rigid Industrial Packaging & Services | 2019 Divestiture
Business Acquisition [Line Items]
Number of divestitures | business												2
Number of subsidiaries liquidated | subsidiary												2
Number of businesses, nonstrategic | business												1
Loss on disposal												$ 3.7
Proceeds from divestiture and deconsolidation												1.5
Rigid Industrial Packaging & Services | 2016 Divestiture
Business Acquisition [Line Items]
Proceeds from divestiture and deconsolidation												1.6
Rigid Industrial Packaging & Services | 2015 Divestiture
Business Acquisition [Line Items]
Proceeds from divestiture and deconsolidation												0.8	0.9	0.8
Notes receivable recorded from sale of business														$ 4.3
Rigid Industrial Packaging & Services | 2017 Divestiture
Business Acquisition [Line Items]
Proceeds from divestiture and deconsolidation													$ 0.5
Flexible Products & Services
Business Acquisition [Line Items]
Number of subsidiaries liquidated | liquidation													2
Number of businesses, nonstrategic | business														1
Tholu B.V.
Business Acquisition [Line Items]
Goodwill	22.3	$ 22.3		22.3								22.3
Total consideration	52.2	52.2
Cash acquired	2.1	2.1
Cash consideration	25.1	25.1
Deferred payments	29.2	$ 29.2
Percentage acquired		100.00%
Caraustar
Business Acquisition [Line Items]
Payments to acquire business			$ 1,834.9
Acquisition-related cost			62.1
Amount recognized in income statement												34.0
Long-term debt			20.8
Other long-term assets			7.3
Goodwill	726.6		752.5	726.6								726.6
Sales attributable to Grief												936.3
Cash consideration			$ 1,834.9									1,834.9
Caraustar | Fair Value Adjustment to Inventory
Business Acquisition [Line Items]
Net income												9.0
Other Current Liabilities | Tholu B.V.
Business Acquisition [Line Items]
Deferred payments		$ 2.5
Other Noncurrent Liabilities | Tholu B.V.
Business Acquisition [Line Items]
Deferred payments		$ 26.7
Debt | Caraustar
Business Acquisition [Line Items]
Acquisition-related cost	$ 28.1			$ 28.1								$ 28.1
Buildings | Minimum
Business Acquisition [Line Items]
Useful life												30 years
Buildings | Minimum | Caraustar
Business Acquisition [Line Items]
Useful life												1 year
Buildings | Maximum
Business Acquisition [Line Items]
Useful life												40 years
Buildings | Maximum | Caraustar
Business Acquisition [Line Items]
Useful life												20 years
Machinery and equipment | Minimum
Business Acquisition [Line Items]
Useful life												5 years
Machinery and equipment | Minimum | Caraustar
Business Acquisition [Line Items]
Useful life												1 year
Machinery and equipment | Maximum
Business Acquisition [Line Items]
Useful life												15 years
Machinery and equipment | Maximum | Caraustar
Business Acquisition [Line Items]
Useful life												15 years