Debt - Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Finance leases	$ 15,000,000		$ 14,000,000
Long-term debt	2,618,000,000		2,612,000,000
Less: Long-term debt due within one year	(16,000,000)		(18,000,000)
Debt issuance costs	(35,000,000)		(36,000,000)
Long-term debt, net	2,567,000,000		2,558,000,000
New Term Loan Facility, net of unamortized discount
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Original Principal	1,300,000,000
Long-term debt, gross	$ 897,000,000		897,000,000
Average effective interest rate	4.50%
Senior Notes due 2029
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Original Principal	$ 1,075,000,000	$ 1,075,000,000
Annual Interest Rate	4.63%	4.625%
Long-term debt, gross	$ 1,075,000,000		1,075,000,000
6.5% Senior Secured Notes due 2025 \| Senior Notes
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Original Principal	$ 500,000,000
Annual Interest Rate	6.50%
Long-term debt, gross	$ 500,000,000		500,000,000
Standard Bank Term Loan Facility
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Original Principal	98,000,000
Long-term debt, gross	$ 98,000,000		92,000,000
Average effective interest rate	6.30%	6.50%
Australian Government Loan, net of unamortized discount
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Long-term debt, gross	$ 1,000,000		1,000,000
MGT Loan
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Original Principal	36,000,000
Long-term debt, gross	$ 32,000,000		$ 33,000,000
Average effective interest rate	3.23%	3.11%
Prior Term Loan Facility, net of unamortized discount
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract]
Average effective interest rate		4.50%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

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