Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, plant and equipment

The following is a summary of property, plant and equipment, at cost less accumulated depreciation and amortization as of December 31:

	Estimated Useful Life (years)	2016		2015
Land and land improvements	0-15	$	16.9	$	6.1
Buildings and building improvements	15-30	129.8		57.7
Machinery, tools and equipment	5-12	121.0		83.5
Leasehold improvements (1)	10	29.4		22.1
Computer equipment	3	133.8		58.4
Computer software	5-10	224.7		188.4
Furniture and fixtures	5-8	75.0		62.0
Tooling	3-5	123.1		104.5
Construction in progress		10.3		26.3
Total property plant and equipment, at cost		$	864.0	$	609.0
Less accumulated depreciation and amortization		477.0		433.7
Total property plant and equipment, net		$	387.0	$	175.3

⁽¹⁾  The estimated useful life for leasehold improvements is the lesser of 10 years or the term of the lease.