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Employee and Retiree Benefit Plans - Weighted Average Asset Allocation for Funded Pension Benefit Plans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement plan assets |  | $ 547,484 | $ 487,094
Weighted average asset allocation |  | 100.00% | 100.00%
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation |  | 54.90% | 56.00%
Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation |  | 26.20% | 42.20%
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation |  | 17.30% |
Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation |  | 1.60% | 1.80%
Domestic Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 54.00% |  |
Domestic Plan | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 27.80% |  |
Domestic Plan | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 16.90% |  |
Domestic Plan | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 1.30% |  |
Domestic Plan | Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 40.00% |  |
Domestic Plan | Minimum | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 25.00% |  |
Domestic Plan | Minimum | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 0.00% |  |
Domestic Plan | Minimum | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 0.00% |  |
Domestic Plan | Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 70.00% |  |
Domestic Plan | Maximum | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 60.00% |  |
Domestic Plan | Maximum | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 20.00% |  |
Domestic Plan | Maximum | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 15.00% |  |
Canadian Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 34.50% |  |
Canadian Plan | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 63.50% |  |
Canadian Plan | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 0.00% |  |
Weighted average asset allocation | 0.00% |  |
Canadian Plan | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 2.00% |  |
Canadian Plan | Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 28.00% |  |
Canadian Plan | Minimum | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 60.00% |  |
Canadian Plan | Minimum | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 0.00% |  |
Canadian Plan | Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 38.00% |  |
Canadian Plan | Maximum | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 70.00% |  |
Canadian Plan | Maximum | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations of plan assets | 10.00% |  |
U.K. Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 59.20% |  |
U.K. Plan | Defined Benefit Plan, Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 18.40% |  |
U.K. Plan | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 20.20% |  |
U.K. Plan | Defined Benefit Plan, Cash and Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocation | 2.20% |  |

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