Leasehold Improvements, Equipment, Land and Construction in Progress, net (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Summary of leasehold improvements, equipment, and construction in progress and related accumulated depreciation and amortization

Leasehold improvements, equipment, and construction in progress and related accumulated depreciation and amortization is as follows:

		December 31
(millions)	Ranges of Estimated Useful Life	2019			2018
Equipment	1 - 10 Years	$	45.2		$	41.5
Software	2 - 5 Years	39.7			34.7
Vehicles	1 - 10 Years	30.0			23.6
Other	3 Years	0.6			0.6
Leasehold improvements	Shorter of lease term or economic life up to 10 years	18.8			17.7
Construction in progress		6.3			4.4
		140.6			122.5
Accumulated depreciation and amortization		(92.7		)	(82.2		)
Leasehold improvements, equipment and construction in progress, net		$	47.9		$	40.3

The table below shows the Company's depreciation and amortization expense related to Leasehold improvements, equipment and construction in progress for the years ended December 31, 2019, 2018 and 2017, and is included in Depreciation and amortization expense within the Consolidated Statements of Income.

	Year Ended December 31,
(millions)	2019		2018		2017
Depreciation expense	$	12.8	$	9.6	$	11.3