Item 1A. RISK FACTORS

No material changes have occurred to the indicated risk factors as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2020.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS


	(c)	Issuer Purchases of Equity Securities We purchased the following equity securities registered by us pursuant to Section 12 of the Exchange Act during the three-month period ended September 30, 2021.


Period	Total Number of Shares Purchased	Average Price Paid per Share			Total Number of Shares Purchased as Part of Publicly Announced Programs (1) (2)		Maximum Dollar Value of Shares That May Yet be Purchased Under the Programs (in thousands) (1) (2)
Quarter ended September 30, 2021

July 1 - 31	1,728,066		$	60.48		1,728,066		$	946,295
August 1 - 31	1,773,977			67.25		1,773,977			826,997
September 1 - 30	1,807,150			62.97		1,807,150			713,196
	5,309,193					5,309,193

	(1)	On February 26, 2020, we announced that our board of directors had authorized a share purchase program of up to $500.0 million of our common stock. This program was completed in July 2021.

	(2)	On July 6, 2021, we announced that our board of directors had authorized an additional share purchase program of up to $1.0 billion of our common stock.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

None.