Impairments (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Total provisions for impairment	$	105.1	$	13.5	$	123.4	$	31.2
Number of properties:
Classified as held for sale	8		1		9		1
Classified as held for investment	18		2		28		4
Sold	17		24		31		36