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5. Notes Payable and Long-Term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Apr. 30, 2019
Debt Instrument [Line Items]      
Other Long-term Debt, Current $ 500,000 $ 500,000  
Long-term Debt and Lease Obligation 1,197,716,000 10,514,000  
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 500,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two 500,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 500,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 500,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five 400,400,000    
Long-term Debt, Maturities, Repayments of Principal after Year Five 808,200,000    
Line of Credit Facility, Remaining Borrowing Capacity 207,500,000    
Letters of Credit Outstanding, Amount 4,700,000    
Performance Guarantee [Member]      
Maturities of Long-term Debt [Abstract]      
Letters of Credit Outstanding, Amount 4,300,000    
3.3%, Senior Notes due 2027      
Maturities of Long-term Debt [Abstract]      
Long-term Debt 395,700,000    
Face amount of debt sold 400,000,000    
3.7%, Senior Notes due 2032      
Maturities of Long-term Debt [Abstract]      
Long-term Debt 790,500,000    
Face amount of debt sold $ 800,000,000    
Senior Notes      
Maturities of Long-term Debt [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 101.00%    
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]      
Debt Instrument [Line Items]      
Other Long-term Debt $ 10,600,000 11,000,000.0  
Line of Credit [Member]      
Maturities of Long-term Debt [Abstract]      
Long-term Line of Credit $ 0    
Line of Credit Facility, Interest Rate at Period End 6.02%    
Letters of Credit Outstanding, Amount $ 200,000    
Line of Credit Facility, Maximum Borrowing Capacity     $ 200,000,000
Senior Notes | 3.3%, Senior Notes due 2027      
Maturities of Long-term Debt [Abstract]      
Senior Notes, Noncurrent 400,000,000.0 0  
Senior Notes | 3.7%, Senior Notes due 2032      
Maturities of Long-term Debt [Abstract]      
Senior Notes, Noncurrent 800,000,000.0    
Senior Notes | Senior Notes      
Maturities of Long-term Debt [Abstract]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (12,400,000) 0  
Long-term Debt $ 1,187,600,000 $ 0  
3.3%, Senior Notes due 2027 | 3.3%, Senior Notes due 2027      
Maturities of Long-term Debt [Abstract]      
Debt Instrument, Interest Rate, Basis for Effective Rate 3.5346    
Debt Instrument, Interest Rate, Stated Percentage 3.30%    
3.7%, Senior Notes due 2032 | 3.7%, Senior Notes due 2032      
Maturities of Long-term Debt [Abstract]      
Debt Instrument, Interest Rate, Basis for Effective Rate 3.8429    
Debt Instrument, Interest Rate, Stated Percentage 3.70%