Subsequent Events - Additional Information (Detail)	1 Months Ended
	Jul. 31, 2022	Jul. 20, 2022 USD ($)	Jul. 01, 2022 Kmt Potline	Jun. 30, 2022 USD ($)
Subsequent Event [Line Items]
Common stock remaining stock available to repurchase | $				$ 150,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of operating smelting potlines curtailed | Potline			1
Number of operating smelting potlines | Potline			3
Operating smelting potlines aluminium facility in Kilo Metric Ton | Kmt			54
Percentage of production reduced	15.00%
Common stock repurchase program, authorized amount | $		$ 500,000,000