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Post Retirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions |  | $ 26.5 |  |
Expected return on plan assets |  | 4.12% |  |
Lump sum payments |  |  |  | $ 45.2
Pension settlement charge | $ 0.9 |  |  | 25.9
Amortization loss of prior service costs |  | $ 0.2 |  |
Fair value of plan assets | $ 594.8 | $ 1,017.0 | $ 594.8 | 568.6
Defined Benefit Plan, Non-participating Annuity Contract, Settlements,Benefit Obligation |  |  |  | 49.2
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement |  |  |  | 94.4
Class A common stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 128,000,000 | 128,000,000 | 128,000,000 |
Class B common stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 69,120,000 | 69,120,000 | 69,120,000 |
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions |  | $ 22.6 | $ 85.5 | 14.4
Company's pension contributions paid directly by the Company |  | 3.9 |  |
Company's estimated pension contributions |  | 27.7 |  |
Pension settlement charge |  |  | 1.3 | 27.8
Aggregated accumulated benefit obligation | $ 638.9 | 1,131.3 | 638.9 |
Fair value of plan assets | $ 594.8 | $ 1,017.0 | $ 594.8 |
Pension Plan | Class A common stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 247,504 | 175,320 | 247,504 |
Pension Plan | Class B common stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 160,710 | 111,270 | 160,710 |
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions paid directly by the Company |  | $ 0.9 | $ 1.0 | 0.8
Company's estimated pension contributions |  | 1.3 |  |
Aggregated accumulated benefit obligation | $ 10.7 | 12.2 | 10.7 |
Fair value of plan assets | 0.0 | 0.0 | 0.0 |
United Kingdom |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 178.7 | 209.8 | 178.7 | 188.9
United Kingdom | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lump sum payments |  | 4.7 |  | 7.3
Pension settlement charge |  |  | 1.3 | 1.2
Aggregated accumulated benefit obligation | 176.3 | 180.8 | 176.3 |
Fair value of plan assets | 178.7 | 209.8 | 178.7 |
Germany |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0.0 | 0.0 | 0.0 | 0.0
Germany | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement charge |  |  | 0.0 | 0.7
Aggregated accumulated benefit obligation | 37.2 | 42.6 | 37.2 |
Fair value of plan assets | $ 0.0 | 0.0 | 0.0 |
Defined Benefit Plan, Projected Benefit Obligation Transferred To Third Party |  |  |  | 1.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Sale Of Business |  |  |  | 0.7
401 (k) Savings Plan |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Company contributions to 401(k) plans |  | $ 21.8 | $ 9.4 | $ 8.3

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