New Accounting Standards (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Standards	In the first quarter of 2020, we adopted the Financial Accounting Standards Board’s (the “FASB’s”) guidance for evaluating and determining when a cloud computing arrangement (hosting arrangement) includes a software license. The adoption of this guidance did not have a material effect on our consolidated financial statements.In the first quarter of 2020, we adopted the FASB’s guidance which requires a reporting entity to estimate credit losses on certain types of financial instruments, and present assets held at amortized cost and available-for-sale debt securities at the amount expected to be collected. The application of this guidance was limited to our receivables that are not related to rental income, which is accounted for under the lease accounting standard. The provision for doubtful accounts is estimated based on historical bad debt experience, the aging of accounts receivable, industry trends and economic indicators, recent payment history for specific customers and expected future trends.