Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Property, Plant and Equipment [Table Text Block]

The estimated useful lives of our major classes of PP&E are as follows:

Major Classes of Property, Plant and Equipment	PP&E Estimated Useful Lives
Buildings and leasehold improvements	10 – 40 years or lease term
Rental and service equipment	3 – 10 years
Machinery and other	2 – 12 years