Summary of Significant Accounting Policies and Procedures and New Accounting Standards (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of reconciliation of the denominator of the diluted net income per common share computation

The following is a reconciliation of the denominator of the basic net income per common share computation to the denominator of the diluted net income per common share computation:


	2021	2020	2019
Weighted average shares used for the basic net income per share computation	414,535,283	345,280,126	315,837,012
Incremental shares from share-based compensation	234,563	135,132	322,265
Weighted average shares used for diluted net income per share computation	414,769,846	345,415,258	316,159,277
Unvested shares from share-based compensation that were anti-dilutive	45,404	70,581	8,113
Weighted average partnership common units convertible to common shares that were anti-dilutive	500,217	463,119	442,073

Schedule of reserves recorded as reduction of rental revenue

The following table summarizes reserves to rental revenue (in millions):


	Year ended December 31,
	2021		2020		2019
Rental revenue reserves	$	10.2	$	44.1	$	1.4
Straight-line rent reserves	4.5		8.4		1.5
Total rental revenue reserves	$	14.7	$	52.5	$	2.9

Schedule of estimated useful lives of assets

Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:


Buildings			25 years or 35 years
Building improvements			4 to 35 years
Equipment			5 to 25 years
Lease commissions and property improvements to accommodate the client's use			The shorter of the term of the related lease or useful life
Acquired in-place leases			Remaining terms of the respective leases