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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 |  |

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