Provisions for Impairments (Tables)

9 Months Ended

Sep. 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 September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Total provisions for impairment	$	11.0	$	105.1	$	31.0	$	123.4
Number of properties:
Classified as held for sale	11		1		12		2
Classified as held for investment	—		16		12		23
Sold	12		26		40		43