Basis of Presentation (Policies)	3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates	Use of Estimates—The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the periods presented. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may vary from these estimates under different assumptions or conditions.
Net Earnings per Common Share	Net Earnings per Common Share—Basic net earnings per share (“EPS”) is based upon net earnings available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net earnings available to common stockholders is calculated as net earnings from continuing operations or net earnings, as applicable, adjusted to include preferred stock dividends accumulated during the period. During the three months ended March 31, 2021, we accumulated dividends of $1 million on the 5.75% Series A Mandatory Convertible Preferred Stock (“Mandatory Convertible Preferred Stock”) that was issued during the first quarter of 2021 (see Note 9). Weighted average shares for diluted EPS reflects the effect of the assumed exercise of stock options and vesting of restricted stock units (“RSUs”) or performance stock units (“PSUs”) only in the periods in which such effect would have been dilutive. Diluted EPS also reflects the effect of the assumed conversion of preferred stock, if dilutive, which includes the issuance of common shares in the weighted average number of shares and excludes the above- mentioned accumulated preferred stock dividend adjustment to net earnings available to common stockholders.
Recently Adopted Accounting Pronouncements and Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements Simplifying the Accounting for Income Taxes On January 1, 2021, we adopted Financial Accounting Standards Board (“FASB”) guidance on the accounting for income taxes that, among other provisions, eliminates certain exceptions to existing guidance related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. This guidance also requires an entity to reflect the effect of an enacted change in tax laws or rates in its effective income tax rate in the interim period that includes the enactment date. The adoption of this guidance did not have a material impact on our consolidated financial statements. Accounting Pronouncements Not Yet Adopted Reference Rate Reform In March 2020, the FASB issued guidance providing optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. The guidance is effective immediately upon issuance and an entity may elect to apply it to contract modifications or hedging relationships entered into on or before December 31, 2022, with a few exceptions for certain hedging relationships existing as of December 31, 2022. We intend to apply this guidance when modifications of contracts that include LIBOR occur, which is not expected to have a material impact on our consolidated financial statements. Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity On August 5, 2020, the FASB issued amended guidance to reduce complexity associated with the accounting for convertible instruments with characteristics of liabilities and equity. Under this guidance, embedded conversion features associated with convertible instruments no longer need to be separated from the host contracts unless they are required to be accounted for as derivatives or have been issued at a substantial premium. For contracts in an entity’s own equity, this guidance removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exceptions. This guidance also amends certain EPS guidance for convertible instruments and expands disclosure requirements. This guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted, and is not expected to have a material impact on our consolidated financial statements.

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Use of Estimates—The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the periods presented. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may vary from these estimates under different assumptions or conditions.

Net Earnings per Common Share

Net Earnings per Common Share—Basic net earnings per share (“EPS”) is based upon net earnings available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net earnings available to common stockholders is calculated as net earnings from continuing operations or net earnings, as applicable, adjusted to include preferred stock dividends accumulated during the period. During the three months ended March 31, 2021, we accumulated dividends of $1 million on the 5.75% Series A Mandatory Convertible Preferred Stock (“Mandatory Convertible Preferred Stock”) that was issued during the first quarter of 2021 (see Note 9).

Weighted average shares for diluted EPS reflects the effect of the assumed exercise of stock options and vesting of restricted stock units (“RSUs”) or performance stock units (“PSUs”) only in the periods in which such effect would have been dilutive. Diluted EPS also reflects the effect of the assumed conversion of preferred stock, if dilutive, which includes the issuance of common shares in the weighted average number of shares and excludes the above-

mentioned accumulated preferred stock dividend adjustment to net earnings available to common stockholders.

Recently Adopted Accounting Pronouncements and Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Pronouncements

Simplifying the Accounting for Income Taxes

On January 1, 2021, we adopted Financial Accounting Standards Board (“FASB”) guidance on the accounting for income taxes that, among other provisions, eliminates certain exceptions to existing guidance related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. This guidance also requires an entity to reflect the effect of an enacted change in tax laws or rates in its effective income tax rate in the interim period that includes the enactment date. The adoption of this guidance did not have a material impact on our consolidated financial statements.

Accounting Pronouncements Not Yet Adopted

Reference Rate Reform

In March 2020, the FASB issued guidance providing optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. The guidance is effective immediately upon issuance and an entity may elect to apply it to contract modifications or hedging relationships entered into on or before December 31, 2022, with a few exceptions for certain hedging relationships existing as of December 31, 2022. We intend to apply this guidance when modifications of contracts that include LIBOR occur, which is not expected to have a material impact on our consolidated financial statements.

Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity

On August 5, 2020, the FASB issued amended guidance to reduce complexity associated with the accounting for convertible instruments with characteristics of liabilities and equity. Under this guidance, embedded conversion features associated with convertible instruments no longer need to be separated from the host contracts unless they are required to be accounted for as derivatives or have been issued at a substantial premium. For contracts in an entity’s own equity, this guidance removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exceptions. This guidance also amends certain EPS guidance for convertible instruments and expands disclosure requirements. This guidance is effective for fiscal years beginning after

December 15, 2021, with early adoption permitted, and is not expected to have a material impact on our consolidated financial statements.