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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
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)		20212020
Land and land improvements
(1)
$10.6 $13.1 
Buildings and building improvements15-3069.1 90.9 
Machinery, tools and equipment 5-1285.2 95.4 
Leasehold improvements (2)
1024.2 22.3 
Computer equipment3105.6 138.0 
Computer software 5-10129.0 140.5 
Furniture and fixtures 5-859.7 61.2 
Tooling 3-5141.2 144.7 
Construction in progress7.8 7.5 
Total property plant and equipment, at cost$632.4 $713.6 
Less accumulated depreciation and amortization494.3 536.1 
Total property plant and equipment, net$138.1 $177.5 
(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 2021, 2020 and 2019, depreciation expense, computed on a straight-line basis over the estimated useful lives of the related assets, was $46.4, $73.7 and $82.2, respectively.

In the second quarter of 2021, the Company sold assets located at the Hamilton, Ohio facility for proceeds of approximately $1.7, which resulted in a gain on sale of $0.4.

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