Post Retirement Benefit Plans - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($) shares	Oct. 31, 2019 USD ($) shares	Oct. 31, 2018 USD ($)	Nov. 01, 2020 USD ($)	Dec. 31, 2019 plan
Defined Benefit Plan Disclosure [Line Items]
Company's pension contributions		$ 26.4
Expected Return on plan assets		4.64%	4.12%	4.53%
Amortization loss of prior service costs		$ 0.2
Fair value of plan assets		$ 1,002.1	$ 1,017.0
Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, annuity					$ 100.0
Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]
Post Retirement Benefit Plan, Projected Benefit Obligation, (Increase) Decrease for Settlement	$ (8.4)
Decrease for remeasurement due to settlement	$ 20.8
Class A common stock
Defined Benefit Plan Disclosure [Line Items]
Common stock shares authorized (shares) | shares		128,000,000	128,000,000
Class B common stock
Defined Benefit Plan Disclosure [Line Items]
Common stock shares authorized (shares) | shares		69,120,000	69,120,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Company's pension contributions		$ 22.4	$ 26.5	$ 85.5
Company's pension contributions paid directly by the Company		4.0
Company's estimated pension contributions		28.7
Settlement, gain (loss)		(0.3)		(1.3)
Aggregated accumulated benefit obligation		1,086.1	1,131.3
Fair value of plan assets		1,002.1	1,017.0	594.8
Income for its post-retirement benefit plans		$ 14.2	$ 13.3	20.6
Pension Plan | Class A common stock
Defined Benefit Plan Disclosure [Line Items]
Common stock shares authorized (shares) | shares		51,576	175,320
Pension Plan | Class B common stock
Defined Benefit Plan Disclosure [Line Items]
Common stock shares authorized (shares) | shares		30,930	111,270
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Company's pension contributions paid directly by the Company		$ 0.9	$ 0.9	1.0
Company's estimated pension contributions		1.3
Aggregated accumulated benefit obligation		11.6
Income for its post-retirement benefit plans		(0.2)	(1.1)	(1.1)
Projected benefit obligation			12.2
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Company's pension contributions		44.3
Number of plans | plan						2
Post Retirement Benefit Plan, Projected Benefit Obligation, (Increase) Decrease for Settlement		44.3
Settlement, gain (loss)		0.1		0.0
Aggregated accumulated benefit obligation		760.3	806.8
Fair value of plan assets		687.0	698.7	311.9
Income for its post-retirement benefit plans		12.5	12.5	15.2
United Kingdom | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement, gain (loss)		(0.4)	(1.3)	(1.3)
Lump sum payments		4.7
Aggregated accumulated benefit obligation		184.6	180.8
Fair value of plan assets		210.0	209.8	178.7
Income for its post-retirement benefit plans		(0.4)	(0.5)	3.8
Germany | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement, gain (loss)		0.0		0.0
Aggregated accumulated benefit obligation		41.0	42.6
Fair value of plan assets		0.0	0.0	0.0
Income for its post-retirement benefit plans		2.4	1.7	2.0
401 (k) Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Company contributions to 401(k) plans		$ 25.2	$ 21.8	$ 9.4