Pension Plans and Postretirement Benefits - Components of Defined Benefit Pension Plans (Details) - U.S. - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
Nov. 30, 2018	Nov. 30, 2019	Dec. 31, 2017
Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	$ 211,257	$ 191,261
Interest cost	6,783	8,070	$ 8,119
Actuarial (gains) losses	(16,646)	29,539
Settlement payments	(3,133)	0
Benefits paid	(7,000)	(9,996)
Projected benefit obligation, end of year	191,261	218,874	211,257
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	150,806	138,992
Actual return on plan assets	(7,676)	30,426
Employer contributions	8,890	9,655
Benefits paid	(7,000)	(9,996)
Settlement payments	(3,133)	0
Administrative expenses	(2,895)	(3,006)
Fair value of plan assets, end of year	138,992	166,071	$ 150,806
Funded status at end of year	$ (52,269)	$ (52,803)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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