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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
The amount of property and equipment and their respective estimated useful lives are as follows (in millions):
As of December 31,Estimated
20202019Useful Lives
Land$19.1 $22.3 Indefinite
Buildings and leasehold improvements74.5 84.8 
3 - 40 years
Office equipment, furniture and fixtures15.3 16.9 
3 -  7  years
Computer equipment and software costs275.8 261.4 
3 -  9  years
Machinery, equipment and vehicles267.7 269.3 
3 - 40 years
652.3 654.8 
Less: Accumulated depreciation and amortization309.7 293.9 
$342.6 $360.9 
Schedule of amount of computer software costs, including capitalized internally developed software costs
The amount of computer software costs, including capitalized internally developed software costs and certain hosting arrangement costs are as follows (in millions):
As of December 31,
20202019
Computer software costs$191.7 $169.9 
Less: Accumulated amortization116.1 110.0 
Computer software costs, net$75.6 $59.9