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

12 Months Ended

Dec. 31, 2020

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 for the years ended December 31, 2020 and 2019, were as follows:

		December 31
(millions)	Estimated Useful Life	2020			2019
Equipment	1 - 10 Years	$	50.1		$	45.2
Software	2 - 5 Years		42.3			39.7
Vehicles	1 - 10 Years		37.3			30.0
Other	3 Years		0.8			0.6
	Shorter of lease term or economic life up to
Leasehold improvements	10 years		18.0			18.8
Construction in progress			6.8			6.3
			155.3			140.6
Accumulated depreciation and amortization			(102.0	)		(92.7	)
Leasehold improvements, equipment and construction in
progress, net		$	53.3		$	47.9

The Company's depreciation and amortization expense related to leasehold improvements and equipment for the years ended December 31, 2020, 2019 and 2018, which was included in Depreciation and amortization expense within the Consolidated Statements of (Loss) Income, was as follows:

	Year Ended December 31,
(millions)	2020		2019		2018
Depreciation expense and amortization	$	15.3	$	12.8	$	9.6