PROPERTY, PLANT AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment, Net

We use the straight-line method to compute depreciation and amortization of these assets, other than mineral deposits, over the following estimated useful lives: 

Class of Assets	Range of Service Lives
Buildings and land improvements	10 to 40 years
Machinery and equipment	10 to 30 years
Mixers, trucks and other vehicles	1 to 12 years
Other	3 to 10 years

	December 31,
($ in millions)	2019			2018
Land and mineral deposits	$	313.0		$	310.4
Buildings and improvements	66.2			65.7
Machinery and equipment	295.7			266.2
Mixers, trucks and other vehicles	258.8			244.0
Other	1.9			1.7
Construction in progress	27.8			28.3
	963.4			916.3
Less: accumulated depreciation, depletion and amortization	(289.9		)	(236.1		)
Total	$	673.5		$	680.2