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Debt (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Short-term debt [Abstract]            
Other - short-term $ 36,000,000     $ 37,000,000    
Short-term debt 36,000,000     37,000,000    
Long-term debt            
Long-term debt 748,000,000     348,000,000    
Amended LOC Agreement Facility Capacity         $ 5,000,000  
LOC Collateral Percentage for draws in the U.S. dollars     103.00%      
LOC collateral percentage for draws in non-U.S. currencies     110.00%      
Letters of Credit Outstanding, Amount 2,000,000          
Debt Instrument, Collateral 1,000,000          
Long-term Debt [Member]            
Long-term debt            
Unsecured long-term debt, non-current 748,000,000     348,000,000    
LOC Facility issued by local affiliates [Member]            
Long-term debt            
Letters of Credit Outstanding, Amount $ 12,000,000          
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Minimum Eurodollar rate used to establish the Base Rate 2.49%          
Long-term debt            
Unsecured long-term debt, non-current $ 400,000,000     0    
Term Loan [Member]            
Debt Instrument [Line Items]            
Minimum Eurodollar rate used to establish the Base Rate 2.79%          
Long-term debt            
Unsecured long-term debt, non-current $ 348,000,000     $ 348,000,000    
Term loan, required periodic payment   0.0175        
Debt Instrument, face amount           $ 350,000,000
Affiliated Entity [Member]            
Long-term debt            
Line of Credit Facility, Capacity Available for Trade Purchases $ 117,000,000          
Revolving Credit Facility [Member]            
Long-term debt            
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000,000      
borrowing capacity under swing line advances     $ 20,000,000      
Maximum [Member]            
Debt Instrument [Line Items]            
Financial maintenance covenant     3.50      
Minimum [Member]            
Debt Instrument [Line Items]            
Financial maintenance covenant     1.00      
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Long-term debt            
Line of Credit Facility, Interest Rate Description 2.00%          
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Long-term debt            
Line of Credit Facility, Interest Rate Description 1.00%