Property and Equipment, net

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

8. Property and Equipment, net

Property and equipment, and the related accumulated depreciation and amortization as of December 31, 2022, 2021 and 2020, were as follows:


		December 31
(millions)	Estimated Useful Life	2022			2021
Equipment	1 - 10 Years	$	54.5		$	51.0
Software	2 - 5 Years		61.0			48.8
Vehicles	1 - 10 Years		39.0			36.2
Other	3 Years		1.3			1.0
	Shorter of lease term or economic life up to
Leasehold improvements	10 years		16.7			16.8
Construction in progress			6.9			7.4
Property and equipment, gross			179.4			161.2
Accumulated depreciation and amortization			(119.2	)		(112.3	)
Property and equipment, net		$	60.2		$	48.9

Asset additions are recorded at cost, which includes interest on significant projects. Depreciation is recorded on a straight-line basis over their estimated useful lives or the terms of the respective leases, whichever is shorter. Leasehold improvements, equipment and construction in progress are reviewed for impairment when conditions indicate an impairment may be present. If the assets are determined to be impaired, they are either written down or the useful life is adjusted to the remaining period of estimated useful life.

The Company's depreciation and amortization expense related to property and equipment during the years ended December 31, 2022, 2021 and 2020, which was included in Depreciation and amortization expense within the Consolidated Statements of Income (Loss), was as follows:


	Year Ended December 31,
(millions)	2022		2021		2020
Depreciation expense and amortization	$	19.8	$	16.4	$	15.3