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Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
Debt (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2018	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2017
Short-term debt [Abstract]
Other - short-term	$ 22,000,000		$ 22,000,000	$ 37,000,000
Short-term debt	22,000,000		22,000,000	37,000,000
Long-term debt
Long-term debt	748,000,000		748,000,000	348,000,000
Debt Instrument, face amount	350,000,000		350,000,000
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000		75,000,000
borrowing capacity under swing line advances	20,000,000		20,000,000
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		2,000,000
Debt Instrument, Collateral	1,000,000		$ 1,000,000
Debt Instrument, Interest Rate Terms			1.75
Long-term Debt [Member]
Long-term debt
Unsecured long-term debt, non-current	748,000,000		$ 748,000,000	348,000,000
LOC Facility issued by local affiliates [Member]
Long-term debt
Letters of Credit Outstanding, Amount	$ 12,000,000		12,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Minimum Eurodollar rate used to establish the Base Rate	2.99%
Long-term debt
Unsecured long-term debt, non-current	$ 400,000,000		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	$ 348,000,000
Affiliated Entity [Member]
Long-term debt
Line of Credit Facility, Capacity Available for Trade Purchases	$ 129,000,000		$ 129,000,000
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%