Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

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)	2020		2019
Land and land improvements	(1)	$	13.1	$	15.3
Buildings and building improvements	15-30	90.9		115.8
Machinery, tools and equipment	5-12	95.4		99.3
Leasehold improvements (2)	10	22.3		25.5
Computer equipment	3	138.0		148.7
Computer software	5-10	140.5		143.5
Furniture and fixtures	5-8	61.2		67.6
Tooling	3-5	144.7		137.7
Construction in progress		7.5		5.0
Total property plant and equipment, at cost		$	713.6	$	758.4
Less accumulated depreciation and amortization		536.1		526.9
Total property plant and equipment, net		$	177.5	$	231.5

(1)Estimated useful life for land and land improvements is perpetual and 15 years, respectively.

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