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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Repayments of notes payable       $ 797,395,000 $ 10,106,000  
Goodwill impairment   $ 0 $ 0 0 20,190,000  
Other notes payable   58,196,000   $ 58,196,000   $ 40,098,000
Debt instrument term       4 years    
Current borrowing capacity   1,000,000,000.0   $ 1,000,000,000.0    
Maximum borrowing capacity   1,500,000,000   1,500,000,000    
Borrowings under revolving credit facility       0 700,000,000  
Repayments under revolving credit facility       0 $ 700,000,000  
Letters of credit outstanding   260,900,000   260,900,000   249,700,000
Line of credit facility, remaining borrowing capacity   739,100,000   739,100,000   750,300,000
Long-term line of credit   352,627,000   352,627,000   411,821,000
Notes Payables | Notes Payable Maturing in 2026            
Debt Instrument [Line Items]            
Repayments of notes payable       200,000,000.0    
Notes Payables | Notes Payable Maturing in 2027            
Debt Instrument [Line Items]            
Repayments of notes payable       100,000,000.0    
Revolving Credit Facility Accordion Feature            
Debt Instrument [Line Items]            
Maximum additional issuance       500,000,000.0    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Borrowings under revolving credit facility $ 700,000,000.0          
Line of credit, current   0   0    
Line of Credit | Financial Services            
Debt Instrument [Line Items]            
Long-term line of credit   352,600,000   352,600,000   $ 411,800,000
Line of Credit | Amendment Effective September 24, 2018 through and including December 25, 2018 | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 375,000,000.0   $ 375,000,000.0    
Maximum            
Debt Instrument [Line Items]            
Stated interest rate   6.00%   6.00%