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Seasonal Financing (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Mar. 19, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 20, 2017
Debt Instrument [Line Items]          
Short-term borrowings $ 128,000,000   $ 969,000 $ 400,000,000  
Credit Agreement          
Debt Instrument [Line Items]          
Outstanding letters of credit 10,000,000   11,000,000 13,000,000  
Revolving Credit Facility | Credit Agreement          
Debt Instrument [Line Items]          
Aggregate commitment under the credit facility   $ 1,400,000,000     $ 1,600,000,000
Short-term borrowings $ 128,000,000   $ 0 $ 400,000,000  
Revolving Credit Facility | Credit Agreement | Minimum | LIBOR          
Debt Instrument [Line Items]          
Interest rate margin for loans (as a percent) 1.25%        
Revolving Credit Facility | Credit Agreement | Minimum | Base Rate          
Debt Instrument [Line Items]          
Interest rate margin for loans (as a percent) 0.25%        
Revolving Credit Facility | Credit Agreement | Maximum | LIBOR          
Debt Instrument [Line Items]          
Interest rate margin for loans (as a percent) 1.75%        
Revolving Credit Facility | Credit Agreement | Maximum | Base Rate          
Debt Instrument [Line Items]          
Interest rate margin for loans (as a percent) 0.75%        
Revolving Credit Facility, Asset Based | Credit Agreement          
Debt Instrument [Line Items]          
Aggregate commitment under the credit facility $ 1,110,000,000        
Revolving Credit Facility, Secured | Credit Agreement          
Debt Instrument [Line Items]          
Aggregate commitment under the credit facility $ 294,000,000