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

12 Months Ended

Dec. 31, 2016

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	2016			2015
Equipment	2 - 10 Years	$	38.6		$	34.5
Software	3 - 10 Years	30.9			27.0
Vehicles	4 Years	8.8			8.7
Other	10 Years	0.5			0.4
Leasehold improvements	Shorter of lease term or economic life up to 10 years	21.7			20.2
Construction in progress		3.3			3.6
		103.8			94.4
Less accumulated depreciation and amortization		(72.9		)	(59.8		)
Leasehold improvements, equipment, land and construction in progress, net		$	30.9		$	34.6