Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Concentration of Credit Risks	Concentration of Credit Risks—Prior to September 2020, we were party to a long-term exclusive triple-net lease (the “Master Lease”) with Windstream Holdings, Inc. (together with Windstream Holdings II, LLC, its successor in interest, and its subsidiaries, “Windstream”) pursuant to which a substantial portion of our real property was leased to Windstream and from which a substantial portion of our leasing revenues were derived. On September 18, 2020, Uniti and Windstream bifurcated the Master Lease and entered into two structurally similar master leases (collectively, the “Windstream Leases”), which amended and restated the Master Lease in its entirety. Revenue under the Windstream Leases and the Master Lease provided 67.1% and 65.2% of our revenue for the six months ended June 30, 2021 and 2020, respectively. Because a substantial portion of our revenue and cash flows are derived from lease payments by Windstream pursuant to the Windstream Leases, there could be a material adverse impact on our consolidated results of operations, liquidity, financial condition and/or ability to pay dividends and service debt if Windstream were to default under the Windstream Leases or otherwise experiences operating or liquidity difficulties and becomes unable to generate sufficient cash to make payments to us. Prior to its emergence from bankruptcy on September 21, 2020, Windstream was a publicly traded company subject to the periodic filing requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Windstream’s historic filings through their quarter ended June 30, 2020 can be found at www.sec.gov. Additionally, the Windstream audited financial statements as of December 31, 2020 and for the period from September 22, 2020 to December 31, 2020 and as of December 31, 2019 and for the period from January 1, 2020 to September 21, 2020 and for each of the two years in the period ended December 31, 2019 are included as an exhibit to our Annual Report. On September 22, 2020, Windstream filed a Form 15 to terminate all filing obligations under Sections 12(g) and 15(d) under the Exchange Act. Windstream filings are not incorporated by reference in this Quarterly Report on Form 10-Q. We monitor the credit quality of Windstream through numerous methods, including by (i) reviewing credit ratings of Windstream by nationally recognized credit agencies, (ii) reviewing the financial statements of Windstream that are required to be delivered to us pursuant to the Windstream Leases, (iii) monitoring news reports regarding Windstream and its business, (iv) conducting research to ascertain industry trends potentially affecting Windstream, (v) monitoring Windstream’s compliance with the terms of the Windstream Leases and (vi) monitoring the timeliness of its payments under the Windstream Leases. As of the date of this Quarterly Report on Form 10-Q, Windstream is current on all lease payments. We note that in August 2020, Moody’s Investor Service assigned a B3 corporate family rating with a stable outlook to Windstream in connection with its post-emergence exit financing. At the same time, S&P Global Ratings assigned Windstream a B- issuer rating with a stable outlook. In order to assist us in our continuing assessment of Windstream’s creditworthiness, we periodically receive certain confidential financial information and metrics from Windstream.
Recently Adopted Accounting Standards	Recently Adopted Accounting Pronouncements In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470- 20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity. ASU 2020-06 (1) simplifies the accounting for convertible debt instruments and convertible preferred stock by removing the existing guidance in ASC 470-20, Debt: Debt with Conversion and Other Options, that requires entities to account for beneficial conversion features and cash conversion features in equity, separately from the host convertible debt or preferred stock; (2) revises the scope exception from derivative accounting in ASC 815-40 for freestanding financial instruments and embedded features that are both indexed to the issuer’s own stock and classified in stockholders’ equity, by removing certain criteria required for equity classification; and (3) revises the guidance in ASC 260, Earnings Per Share, to require entities to calculate diluted earnings per share (“EPS”) for convertible instruments by using the if-converted method. In addition, entities must presume share settlement for purposes of calculating diluted EPS when an instrument may be settled in cash or shares. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years, with early adoption permitted. The Company elected to early adopt the guidance ASU 2020-06 as of January 1, 2021 using the modified retrospective transition method. Pursuant to the transition guidance, the Company is required to apply the guidance to all impacted financial instruments that were outstanding as of January 1, 2021 with the cumulative effect recognized as an adjustment to the opening balance of retained earnings. As a result of early adopting ASU 2020-06, the Company made certain adjustments to its accounting for the outstanding exchangeable senior unsecured notes. The adoption of ASU 2020-06 resulted in the re-combination of the liability and equity components of these notes into a single liability instrument. The carrying value as of December 31, 2020, totaled approximately $275.4 million and as a result of the adoption increased by $61.1 million to $336.5 million as of January 1, 2021. Because of this adoption, the effective interest rate on the exchangeable senior unsecured notes went from 11.1% to 4.8%. Additional paid-in-capital was reduced by $59.9 million and deferred tax liabilities were reduced by $15.8 million. Approximately $14.6 million of cumulative effect of adoption was recognized to the opening balance of retained earnings as of January 1, 2021.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

Concentration of Credit Risks—Prior to September 2020, we were party to a long-term exclusive triple-net lease (the “Master Lease”) with Windstream Holdings, Inc. (together with Windstream Holdings II, LLC, its successor in interest, and its subsidiaries, “Windstream”) pursuant to which a substantial portion of our real property was leased to Windstream and from which a substantial portion of our leasing revenues were derived. On September 18, 2020, Uniti and Windstream bifurcated the Master Lease and entered into two structurally similar master leases (collectively, the “Windstream Leases”), which amended and restated the Master Lease in its entirety. Revenue under the Windstream Leases and the Master Lease provided 67.1% and 65.2% of our revenue for the six months ended June 30, 2021 and 2020, respectively. Because a substantial portion of our revenue and cash flows are derived from lease payments by Windstream pursuant to the Windstream Leases, there could be a material adverse impact on our consolidated results of operations, liquidity, financial condition and/or ability to pay dividends and service debt if Windstream were to default under the Windstream Leases or otherwise experiences operating or liquidity difficulties and becomes unable to generate sufficient cash to make payments to us.

Prior to its emergence from bankruptcy on September 21, 2020, Windstream was a publicly traded company subject to the periodic filing requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Windstream’s historic filings through their quarter ended June 30, 2020 can be found at www.sec.gov. Additionally, the Windstream audited financial statements as of December 31, 2020 and for the period from September 22, 2020 to December 31, 2020 and as of December 31, 2019 and for the period from January 1, 2020 to September 21, 2020 and for each of the two years in the period ended December 31, 2019 are included as an exhibit to our Annual Report. On September 22, 2020, Windstream filed a Form 15 to terminate all filing obligations under Sections 12(g) and 15(d) under the Exchange Act. Windstream filings are not incorporated by reference in this Quarterly Report on Form 10-Q.

We monitor the credit quality of Windstream through numerous methods, including by (i) reviewing credit ratings of Windstream by nationally recognized credit agencies, (ii) reviewing the financial statements of Windstream that are required to be delivered to us pursuant to the Windstream Leases, (iii) monitoring news reports regarding Windstream and its business, (iv) conducting research to ascertain industry trends potentially affecting Windstream, (v) monitoring Windstream’s compliance with the terms of the Windstream Leases and (vi) monitoring the timeliness of its payments under the Windstream Leases.

As of the date of this Quarterly Report on Form 10-Q, Windstream is current on all lease payments. We note that in August 2020, Moody’s Investor Service assigned a B3 corporate family rating with a stable outlook to Windstream in connection with its post-emergence exit financing. At the same time, S&P Global Ratings assigned Windstream a B- issuer rating with a stable outlook. In order to assist us in our continuing assessment of Windstream’s creditworthiness, we periodically receive certain confidential financial information and metrics from Windstream.

Recently Adopted Accounting Standards

Recently Adopted Accounting Pronouncements

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470- 20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity. ASU 2020-06 (1) simplifies the accounting for convertible debt instruments and convertible preferred stock by removing the existing guidance in ASC 470-20, Debt: Debt with Conversion and Other Options, that requires entities to account for beneficial conversion features and cash conversion features in equity, separately from the host convertible debt or preferred stock; (2) revises the scope exception from derivative accounting in ASC 815-40 for freestanding financial instruments and embedded features that are both indexed to the issuer’s own stock and classified in stockholders’ equity, by removing certain criteria required for equity classification; and (3) revises the guidance in ASC 260, Earnings Per Share, to require entities to calculate diluted earnings per share (“EPS”) for convertible instruments by using the if-converted method.

In addition, entities must presume share settlement for purposes of calculating diluted EPS when an instrument may be settled in cash or shares. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years, with early adoption permitted. The Company elected to early adopt the guidance ASU 2020-06 as of January 1, 2021 using the modified retrospective transition method. Pursuant to the transition guidance, the Company is required to apply the guidance to all impacted financial instruments that were outstanding as of January 1, 2021 with the cumulative effect recognized as an adjustment to the opening balance of retained earnings.

As a result of early adopting ASU 2020-06, the Company made certain adjustments to its accounting for the outstanding exchangeable senior unsecured notes. The adoption of ASU 2020-06 resulted in the re-combination of the liability and equity components of these notes into a single liability instrument. The carrying value as of December 31, 2020, totaled approximately $275.4 million and as a result of the adoption increased by $61.1 million to $336.5 million as of January 1, 2021. Because of this adoption, the effective interest rate on the exchangeable senior unsecured notes went from 11.1% to 4.8%. Additional paid-in-capital was reduced by $59.9 million and deferred tax liabilities were reduced by $15.8 million. Approximately $14.6 million of cumulative effect of adoption was recognized to the opening balance of retained earnings as of January 1, 2021.