Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 consisted of the following:

(dollars in millions)	North America		Rest of World		Total
Balance at December 31, 2018	$	453.9	$	59.1	$	513.0
Acquisition	31.0		—		31.0
Currency translation adjustment	2.0		—		2.0
Balance at December 31, 2019	486.9		59.1		546.0
Currency translation adjustment	0.8		—		0.8
Balance at December 31, 2020	$	487.7	$	59.1	$	546.8

Schedule of Indefinite-Lived Intangible Assets

The carrying amount of other intangible assets consisted of the following:

	2020						2019
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Amortizable intangible assets:
Patents	$	3.7	$	(3.7)	$	—	$	3.7	$	(3.5)	$	0.2
Customer lists	278.0		(138.1)		139.9		278.0		(123.6)		154.4
Total amortizable intangible assets	281.7		(141.8)		139.9		281.7		(127.1)		154.6
Indefinite-lived intangible assets:
Trade names	184.0		—		184.0		183.8		—		183.8
Total intangible assets	$	465.7	$	(141.8)	$	323.9	$	465.5	$	(127.1)	$	338.4

Schedule of Finite-Lived Intangible Assets

The carrying amount of other intangible assets consisted of the following:

	2020						2019
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Amortizable intangible assets:
Patents	$	3.7	$	(3.7)	$	—	$	3.7	$	(3.5)	$	0.2
Customer lists	278.0		(138.1)		139.9		278.0		(123.6)		154.4
Total amortizable intangible assets	281.7		(141.8)		139.9		281.7		(127.1)		154.6
Indefinite-lived intangible assets:
Trade names	184.0		—		184.0		183.8		—		183.8
Total intangible assets	$	465.7	$	(141.8)	$	323.9	$	465.5	$	(127.1)	$	338.4