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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT 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)		20202019
Land and land improvements
(1)
$13.1 $15.3 
Buildings and building improvements15-3090.9 115.8 
Machinery, tools and equipment 5-1295.4 99.3 
Leasehold improvements (2)
1022.3 25.5 
Computer equipment3138.0 148.7 
Computer software 5-10140.5 143.5 
Furniture and fixtures 5-861.2 67.6 
Tooling 3-5144.7 137.7 
Construction in progress7.5 5.0 
Total property plant and equipment, at cost$713.6 $758.4 
Less accumulated depreciation and amortization536.1 526.9 
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.

During 2020, 2019 and 2018, depreciation expense, computed on a straight-line basis over the estimated useful lives of the related assets, was $73.7, $82.2 and $94.5, respectively.

In the fourth quarter of 2020, the Company sold its Corporate Headquarters in North Canton, Ohio for proceeds of $7.2, which resulted in a gain on sale of $0.6.