New Accounting Pronouncement	3 Months Ended
New Accounting Pronouncement	Mar. 31, 2020
New Accounting Pronouncements, Policy [Abstract]
New Accounting Pronouncement, Policy [Policy Text Block]	New Accounting Pronouncements and Impending LIBOR Transition New Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-13, "Financial Instruments - Credit Losses", which introduces new guidance for an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for equity securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. Instruments in scope include loans, held-to-maturity debt securities, and net investments in leases as well as reinsurance and trade receivables. In November 2018, the FASB issued ASU No. 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses", which clarifies that operating lease receivables are outside the scope of the new standard. ASU No. 2016-13 is effective for financial statements issued for fiscal years and interim periods beginning after December 15, 2019. On January 1, 2020, we adopted ASU No. 2016–13, "Financial Instruments – Credit Losses", which did not have a material impact to our consolidated financial statements. In March 2020, the FASB issued ASU No. 2020-04, "Reference Rate Reform - Topic 848", which contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives, and other contracts. The guidance in ASU No. 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the three months ended March 31, 2020, we have elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. We continue to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur. In April 2020, the FASB issued interpretive guidance relating to the accounting for lease concessions provided as a result of the COVID-19 pandemic. In this guidance, entities can elect not to apply lease modification accounting with respect to such lease concessions and instead, treat the concession as if it was a part of the existing contract. This guidance is only applicable to COVID-19 related lease concessions that do not result in a substantial increase in the rights of the lessor or the obligations of the lessee. We are currently evaluating the impact of this guidance and whether we will make this policy election for future lease concessions, with such election applied consistently to leases with similar characteristics and similar circumstances. The future impact of this interpretive guidance is dependent upon the extent of lease concessions granted to tenants as a result of the COVID-19 pandemic in future periods and the elections made by us at the time of entering into such concessions. LIBOR Transition In July 2017, the Financial Conduct Authority (FCA), the authority that regulates LIBOR, announced it intends to stop compelling banks to submit rates for the calculation of LIBOR after 2021. As a result, the Federal Reserve Board and the Federal Reserve Bank of New York organized the Alternative Reference Rates Committee, which identified the Secured Overnight Financing Rate (SOFR) as its preferred alternative rate for USD-LIBOR in derivatives and other financial contracts. We are not able to predict when LIBOR will cease to be available or when there will be sufficient liquidity in the SOFR markets. Any changes adopted by the FCA or other governing bodies in the method used for determining LIBOR may result in a sudden or prolonged increase or decrease in reported LIBOR. If that were to occur, our interest payments could change. In addition, uncertainty about the extent and manner of future changes may result in interest rates and/or payments that are higher or lower than if LIBOR were to remain available in its current form. We have material contracts that are indexed to LIBOR and are monitoring and evaluating the related risks, which include interest on loans or amounts received and paid on derivative instruments. Refer to "Note 5 - Beneficial Interest in Debt and Interest Expense" and "Note 7 - Derivative and Hedging Activities" to our consolidated financial statements for more details on our loans and derivative instruments, respectively. These risks arise in connection with transitioning contracts to an alternative rate, including any resulting value transfer that may occur. The value of loans or derivative instruments tied to LIBOR could also be impacted if LIBOR is limited or discontinued. For some instruments the method of transitioning to an alternative reference rate may be challenging, especially if we cannot agree with the respective counterparty about how to make the transition. If a contract is not transitioned to an alternative reference rate and LIBOR is discontinued, the impact on our contracts is likely to vary by contract. If LIBOR is discontinued or if the methods of calculating LIBOR change from their current form, interest rates on our current or future indebtedness may be adversely affected. While we expect LIBOR to be available in substantially its current form until the end of 2021, it is possible that LIBOR will become unavailable prior to that point. This could result, for example, if sufficient banks decline to make submissions to the LIBOR administrator. In that case, the risks associated with the transition to an alternative reference rate will be accelerated and magnified. Alternative rates and other market changes related to the replacement of LIBOR, including the introduction of financial products and changes in market practices, may lead to risk modeling and valuation challenges, such as adjusting interest rate accrual calculations and building a term structure for an alternative rate. The introduction of an alternative rate also may create additional basis risk and increased volatility as alternative rates are phased in and utilized in parallel with LIBOR. We are currently evaluating the impact that the LIBOR transition will have on our consolidated financial statements.