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Accounting Policies (Narratives) (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Cash, Insured and Uninsured [Abstract] |  |  |  |  |  |
Cash, FDIC Insured Amount | $ 250,000 |  |  |  |  |
Cash, CDIC insured amount | $ 100,000 |  |  |  |  |
LIFO Method Related Items [Abstract] |  |  |  |  |  |
Percentage of LIFO inventory | 96.00% |  |  |  |  |
Inventory, LIFO reserve | $ 21,832,000 |  | $ 18,886,000 |  |  |
Effect of LIFO inventory liquidation on income | 400,000 |  |  |  |  |
Disposition of Property, Plant and Equipment |  |  |  |  |  |
Net amount of (gains) losses netted against depreciation expense | 54,100,000 |  | 27,100,000 |  | $ 27,000,000.0 |
Additional operating expenses | $ 21,200,000 |  | 27,700,000 |  |  |
Schedule of rental trucks depreciation: |  |  |  |  |  |
Percentage reduction for year one, depreciation | 16.00% |  |  |  |  |
Percentage reduction for year two, depreciation | 13.00% |  |  |  |  |
Percentage reduction for year three, depreciation | 11.00% |  |  |  |  |
Percentage reduction for year four, depreciation | 9.00% |  |  |  |  |
Percentage reduction for year five, depreciation | 8.00% |  |  |  |  |
Percentage reduction for year six, depreciation | 7.00% |  |  |  |  |
Percentage reduction for year seven, depreciation | 6.00% |  |  |  |  |
Salvage value percentage under the old declining balance method | 15.00% |  |  |  |  |
Salvage value percentage | 5.70% |  |  |  |  |
Real Estate Companies Disclosures [Abstract] |  |  |  |  |  |
Carrying value of surplus real estate | $ 68,800,000 |  | 69,600,000 |  |  |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |  |  |
Self insurance reserve | 427,100,000 |  | 410,100,000 |  |  |
Accrued insurance, noncurrent | 17,500,000 |  | 15,700,000 |  |  |
Marketing and Advertising Expense [Abstract] |  |  |  |  |  |
Advertising expense | 18,000,000.0 |  | 13,700,000 |  | 10,600,000 |
Policyholder Benefits and Claims Incurred [Abstract] |  |  |  |  |  |
Deferred sales inducements, net |  | $ 16,000,000.0 |  | $ 16,800,000 |  |
Deferred sales inducements, amortization expense |  | $ 4,300,000 |  | $ 5,500,000 |  | $ 3,700,000
Adoption of New Accounting Pronounements |  |  |  |  |  |
Other components of net periodic benefit cost | 987,000 |  | 1,054,000 |  | $ 1,013,000 |
Operating lease commitment, asset | 877,038,000 |  | $ 1,080,353,000 |  |  |
Operating lease commitment, liability | $ 92,510,000 |  |  |  |  |

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