Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

	December 31, 2020							December 31, 2019
	Weighted Average Remaining Useful Life (Years)	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Customer relationships	9.2	$	87.5	$	44.5	$	43.0	$	86.6	$	39.6	$	47.0
Indefinite-lived tradenames	*	25.2		*		25.2		24.6		*		24.6
Technology	14.5	23.7		6.4		17.3		22.9		5.3		17.6
Other	6.7	4.9		3.6		1.3		4.8		3.4		1.4
Total		$	141.3	$	54.5	$	86.8	$	138.9	$	48.3	$	90.6
* Not applicable, as these tradenames have an indefinite life.

Schedule of indefinite-lived intangible assets

	December 31, 2020							December 31, 2019
	Weighted Average Remaining Useful Life (Years)	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Customer relationships	9.2	$	87.5	$	44.5	$	43.0	$	86.6	$	39.6	$	47.0
Indefinite-lived tradenames	*	25.2		*		25.2		24.6		*		24.6
Technology	14.5	23.7		6.4		17.3		22.9		5.3		17.6
Other	6.7	4.9		3.6		1.3		4.8		3.4		1.4
Total		$	141.3	$	54.5	$	86.8	$	138.9	$	48.3	$	90.6
* Not applicable, as these tradenames have an indefinite life.

Schedule of amortization of intangible assets

Amortization expense of other intangible assets as follows:

	Year Ended December 31,
	2020		2019		2018
Amortization expense	$	6.2	$	6.5	$	6.9

Amortization for the next five years

We estimate amortization expense for the five years subsequent to 2020 as follows:

2021	$	6.5
2022	$	6.4
2023	$	6.2
2024	$	6.1
2025	$	6.1