Basis of Presentation and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives of Depreciable Assets

Provisions for depreciation and amortization have been computed principally by the straight-line method based on the estimated useful lives of the depreciable assets which are generally as follows:

Category	Useful Life
Buildings	30 years
Leased assets and leasehold improvements	Amortized over the lesser of the economic life of the asset or the term of the lease
Machinery and equipment	3 – 10 years

The classes of property, plant and equipment as of December 31 are summarized as follows:

($ in millions)	2021		2020
Land and improvements	$	6.1	$	6.1
Buildings and leasehold improvements	68.2		65.5
Machinery and equipment	282.6		265.6
Gross property, plant and equipment	356.9		337.2
Less: accumulated depreciation	(256.3)		(240.4)
Property, plant and equipment, net (a)	$	100.6	$	96.8
(a) Includes property, plant and equipment, net in the United States of $73.8 million and $74.0 million as of December 31, 2021 and 2020, respectively.