Impairments (Tables)

9 Months Ended

Sep. 30, 2019

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,
	2019		2018		2019		2018
Total provisions for impairment	$	13.5	$	6.9	$	31.2	$	25.0
Number of properties:
Classified as held for sale	9		—		9		—
Classified as held for investment	2		1		4		3
Sold	16		18		28		36