Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

The following tables present certain information regarding our intangible assets. Amortizable intangible assets are being amortized on a straight-line basis over their estimated useful lives of ten years with no estimated residual values, which materially approximates the expected pattern of use.

	December 31, 2021			December 31, 2020
	(in millions)
Trademarks	$	22.1		$	22.4
Customer relationships		32.7			20.7
		54.8			43.1
Less: accumulated amortization		(35.9	)		(35.4	)
	$	18.9		$	7.7

Schedule of Estimated Intangible Asset Amortization Expense

The estimated intangible asset amortization expense for the years ending December 31 are as follows:

Year ending December 31, (in millions)
2022	$	1.8
2023		1.8
2024		1.8
2025		1.8
2026		1.8
Thereafter		9.9
Total	$	18.9

Schedule of Goodwill

Goodwill is summarized as follows:

	December 31, 2021			December 31, 2020
	(in millions)
Balance at beginning of period	$	83.7		$	80.9
Foreign currency translation adjustments		(1.0	)		2.6
Acquisition of NTG		—			0.2
Ending balance	$	82.7		$	83.7