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Number of Semi Annual Coupon Payments

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

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Long-Term Debt - Additional Information (Details) $ in Thousands, € in Millions				3 Months Ended			12 Months Ended			15 Months Ended
	Oct. 31, 2019 USD ($)	Aug. 14, 2019 USD ($)	Oct. 15, 2014 USD ($)	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2020	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2021	Dec. 15, 2020 USD ($)	Nov. 25, 2019 USD ($)	Dec. 18, 2014	Dec. 08, 2014 EUR (€)	Nov. 24, 2014 USD ($)	Jan. 22, 2014 USD ($) payment	May 29, 2013 USD ($)
Debt Instrument [Line Items]
Aggregate annual maturities of long-term debt, 2020							$ 804,700
Aggregate annual maturities of long-term debt, 2021							200,000
Aggregate annual maturities of long-term debt, 2022							223,900
Aggregate annual maturities of long-term debt, 2023							425,000
Aggregate annual maturities of long-term debt, 2024							610,800
Aggregate annual maturities of long-term debt, thereafter							1,328,000
Loss on early extinguishment of debt							0	$ 4,829	$ 0
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months							3,300
Revolving credit facility, remaining borrowings available							$ 1,180,000
Credit facility maturity date extension							4 years
Mineral Resources Limited Wodgina Project
Debt Instrument [Line Items]
Ownership percentage	60.00%						60.00%
1.125% Notes
Debt Instrument [Line Items]
Principal amount of debt												$ 500,000
Debt instrument, interest rate							0.01125%	0.01125%				1.125%
Interest rate of debt, effective percentage												1.30%
1.625% Notes
Debt Instrument [Line Items]
Principal amount of debt												$ 500,000
Debt instrument, interest rate							0.01625%	0.01625%				1.625%
Interest rate of debt, effective percentage												1.74%
3.45% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt												$ 300,000
Debt instrument, interest rate							0.0345%	0.0345%				3.45%
Interest rate of debt, effective percentage												3.58%
Floating Rate Notes
Debt Instrument [Line Items]
Principal amount of debt												$ 200,000
Interest rate margin							1.05%
Interest rate during period							1.271%
4.50% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate							4.50%
1.875% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt \| €														€ 393.0
Debt instrument, interest rate							0.01875%	0.01875%					1.875%	1.875%
Interest rate of debt, effective percentage														2.10%
Other comprehensive income (loss) before reclassifications, before tax							$ (34,200)	$ 8,400	$ 25,800
4.15% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt															$ 425,000
Debt instrument, interest rate							0.0415%	0.0415%							4.15%
Interest rate of debt, effective percentage															5.06%
Number of semi annual coupon payments \| payment																20
5.45% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt															$ 350,000
Debt instrument, interest rate							0.0545%	0.0545%							5.45%
Interest rate of debt, effective percentage															5.50%
Commercial Paper
Debt Instrument [Line Items]
Commercial paper notes							$ 325,000
Weighted-average interest rate							0.51%
Debt instrument weighted average maturity period							16 days
Line of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity							$ 220,000
Credit facility, borrowings outstanding							$ 7,700	$ 7,300
Average interest rate on borrowings							0.36%	0.36%	0.69%
Maximum \| Commercial Paper
Debt Instrument [Line Items]
Commercial paper notes																	$ 750,000
Debt instrument, maturity term							397 days
2019 Credit Facility
Debt Instrument [Line Items]
Interest rate margin							1.50%
Repayment of 2019 Credit Facility							$ 1,000,000
Credit facility, maximum borrowing capacity	$ 200,000	$ 1,200,000
Credit facility, borrowings outstanding	$ 1,000,000
Line of Credit Facility, Current Borrowing Capacity											$ 500,000
2019 Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate margin		1.125%
2019 Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate margin		1.75%
2018 Credit Agreement
Debt Instrument [Line Items]
Interest rate margin							1.325%
Credit facility, maximum borrowing capacity		$ 1,000,000
Credit facility, borrowings outstanding							$ 0
2018 Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate margin		0.91%
2018 Credit Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate margin		1.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity							$ 1,200,000
Debt covenant		50000000000.00%
Debt Covenant Ratio, Maximum Debt to EBITDA		3.50
Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Covenant Ratio, Maximum Debt to EBITDA						4.00
Priority Debt Basket							0.24
Credit Facilities [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Debt Covenant Ratio, Maximum Debt to EBITDA				3.50	4.00					4.50
Interest Rate Swap \| JP Morgan
Debt Instrument [Line Items]
Derivative, notional amount																$ 325,000
Payment for settlement of interest rate swap			$ 33,400
Commercial Paper
Debt Instrument [Line Items]
Repayments of commercial paper							$ 370,000
Senior Notes \| 4.50% Senior Notes
Debt Instrument [Line Items]
Repayments of debt							$ 175,200