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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 01, 2020
Feb. 29, 2020
Dec. 31, 2019
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Credit facility amount $ 10,900,000      
Line of credit availability 175,000,000.0      
Letter of credit could be issued 164,100,000      
Term Loan A [Member]        
Debt Instrument [Line Items]        
Line of credit availability 500,000,000.0     $ 500,000,000.0
Bi-lateral Facility [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Credit facility amount 10,900,000      
Line of credit availability 25,000,000.0      
Letter of credit could be issued 14,100,000      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of credit availability 500,000,000.0     500,000,000.0
Amount outstanding 195,000,000.0     115,000,000.0
Revolving Credit Facility [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit availability 150,000,000.0     150,000,000.0
Letter of credit could be issued 150,000,000.0      
Securitization Facility [Member]        
Debt Instrument [Line Items]        
Line of credit availability   $ 30,000,000.0 $ 36,200,000  
Amount outstanding $ 30,000,000.0     0
Maturity date Sep. 30, 2020      
Weighted-average interest rate on short-term debt 1.69%      
Securitization Facility [Member] | ARC [Member]        
Debt Instrument [Line Items]        
Ownership interest 100.00%      
Securitization Facility [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Letter of credit could be issued $ 0      
Senior Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility amount $ 1,000,000,000.0     $ 1,000,000,000.0