Long-Term Debt (Term Loan Facility Narrative) (Details) - USD ($)					1 Months Ended	12 Months Ended
	Nov. 05, 2019	Oct. 04, 2019	Mar. 27, 2019	Mar. 12, 2019	Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-term debt [Line Items]
Debt amount extinguished			$ 600,000,000	$ 468,000,000
Debt issuance costs	$ 5,000,000					$ 10,000,000
Payment of debt issuance costs and original issue discount costs	6,000,000
Original debt issue discount	$ 1,000,000
Derivative, floor interest rate	0.00%
Percentage of capital stock of direct foreign subsidiaries						65.00%
Loss on extinguishment of debt	$ 1,000,000					$ (8,000,000)	$ (10,000,000)	$ (6,000,000)
Term of agreement	7 years
Notional amount	$ 550,000,000					550,000,000	$ 650,000,000	$ 650,000,000
Derivative fixed rate	1.615%
Short-term Debt [Member]
Long-term debt [Line Items]
Debt amount extinguished		$ 150,000,000
Old Term Loan Facility [Member]
Long-term debt [Line Items]
Amount received from terminated interest rate swap						$ 12,000,000
Senior Secured Term Loan Facility Maturing In 2023 [Member]
Long-term debt [Line Items]
Debt amount extinguished	$ 171,000,000
Senior Secured Term Loan Facility Maturing In 2026 [Member]
Long-term debt [Line Items]
Face amount of debt instrument	$ 600,000,000
Derivative fixed rate	3.365%
Fourth Amendment, Term Loan Facility [Member]
Long-term debt [Line Items]
Debt Instrument, Premium Percentage						1
Fourth Amendment, Term Loan Facility [Member] | LIBOR [Member]
Long-term debt [Line Items]
Borrowing margin (as a percent)						1.75%
Fourth Amendment, Term Loan Facility [Member] | Alternative Base Rate [Member]
Long-term debt [Line Items]
Borrowing margin (as a percent)						0.75%
Revolving Credit Facility Maturing In 2021 [Member]
Long-term debt [Line Items]
Debt amount extinguished	$ 120,000,000
Revolving Credit Facility Maturing In 2024 [Member]
Long-term debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000,000
Revolving Credit Facility Maturing In 2024 [Member] | LIBOR [Member]
Long-term debt [Line Items]
Borrowing margin (as a percent)							2.50%
Revolving Credit Facility Maturing In 2024 [Member] | Alternative Base Rate [Member]
Long-term debt [Line Items]
Borrowing margin (as a percent)							1.50%
7.25% Notes Maturing In 2038 [Member]
Long-term debt [Line Items]
Interest rate (as a percent)						7.25%
7.45% Notes Maturing In 2027 [Member]
Long-term debt [Line Items]
Debt amount extinguished					$ 1,000,000
Interest rate (as a percent)					7.45%	7.45%