Provisions for Impairments (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of provisions for impairment

The following table summarizes our provisions for impairment during the periods indicated below (dollars in millions):

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Total provisions for impairment	$	17.2	$	13.9	$	20.0	$	18.3
Number of properties:
Classified as held for sale	14		1		14		1
Classified as held for investment	5		7		9		7
Sold	18		17		28		28