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Basis of Presentation - Narrative (Details) $ in Millions		3 Months Ended			12 Months Ended
	Apr. 08, 2020 USD ($)	Dec. 31, 2020 USD ($) segment	Sep. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Deferred acquisition-related installment payment classified as cash used for investing activities					$ 0	$ 10	$ 37
Deferred acquisition-related installment payment adjusted to financing activities					$ 10	0	0
Number of reportable segments | segment		4			4
Revolving credit facility borrowed amount				$ 150	$ 300	150	$ 0
Deferred tax payments						$ 78
Senior Secured Revolving Credit Facility [Member]
Segment Reporting Information [Line Items]
Revolving credit facility borrowed amount	$ 300
COVID 19 [Member]
Segment Reporting Information [Line Items]
Deferred tax payments		$ 80			80
Payment of tax		$ 35
COVID 19 [Member] | Senior Secured Revolving Credit Facility [Member]
Segment Reporting Information [Line Items]
Revolving credit facility borrowed amount	$ 300
Southern Ionics Minerals, LLC [Member]
Segment Reporting Information [Line Items]
Deferred acquisition-related installment payment classified as cash used for investing activities			$ 10
Deferred acquisition-related installment payment adjusted to financing activities					$ 10

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