Item 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

As of September 30, 2021, management carried out, under the supervision and with the participation of our principal executive officer and principal financial officer, an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended). Based on this evaluation, our principal executive officer and principal financial officer concluded that, as of September 30, 2021, our disclosure controls and procedures were effective in ensuring that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time periods specified in applicable rules and forms and are designed to ensure that information required to be disclosed in those reports is accumulated and communicated to management, including our principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the quarter ended September 30, 2021 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1—LEGAL PROCEEDINGS

We are party to a number of claims and lawsuits incidental to our business. In our opinion, the liabilities, if any, which may ultimately result from the outcome of such matters, individually or in the aggregate, are not expected to have a material adverse effect on our financial position, liquidity, results of operations or cash flows. See "Note 14—Commitments and Contingencies" in the notes to the accompanying unaudited consolidated financial statements for information about certain legal matters.

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

(c) Purchases of Equity Securities by the Issuer and Affiliated Purchasers

Information about the shares of our common stock that we repurchased during the quarter ended September 30, 2021 is set forth below:

(1)Our board of directors has authorized us to repurchase shares of our common stock through any combination of Rule 10b5-1 open-market repurchase plans, accelerated share repurchase ("ASR") plans, discretionary open-market purchases or privately negotiated transactions. During the quarter ended September 30, 2021, pursuant to our employee incentive plans, we withheld 203,137 shares, at an average price per share of $169.48, in order to satisfy employees' tax withholding and payment obligations in connection with the vesting of awards of restricted stock.

(2)As of September 30, 2021, we had $949.2 million of share repurchase authority remaining under our share repurchase program. The board authorization does not expire but could be revoked at any time. In addition, we are not required by the board’s authorization or otherwise to complete any repurchases by any specific time or at all.