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Accounting Policies (Narratives) (Details) - USD ($)
12 Months Ended
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