Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

Depreciation is computed using the straight-line method over the following estimated useful lives:

Buildings and improvements:
Buildings and improvements	2 to 33 years
Leasehold improvements	1 to 39 years
Machinery and equipment:
Computer hardware	3 to 5 years
Computer software	3 to 10 years
Factory machinery and equipment	1 to 15 years
Research and development equipment	3 to 10 years
Vehicles	2 to 8 years

Components of Property, plant and equipment, net were as follows (in millions):

	As of December 31,
	2017			2016
Land	$	35.7		$	33.9
Buildings and improvements	234.4			218.2
Machinery and equipment	804.4			742.1
Capital leases	27.5			27.3
Construction in progress and equipment not yet in service	70.0			57.1
Total	1,172.0			1,078.6
Less accumulated depreciation	(774.2		)	(717.2		)
Property, plant and equipment, net	$	397.8		$	361.4