Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

	December 31, 2018							December 31, 2017
	Weighted Average Remaining Useful Life (Years)	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Customer relationships	11.0	$	86.0	$	34.5	$	51.5	$	83.4	$	29.3	$	54.1
Indefinite-lived tradenames	*	24.1		*		24.1		23.7		*		23.7
Technology	16.5	22.9		4.1		18.8		23.6		3.0		20.6
Other	6.6	4.1		3.2		0.9		4.1		3.0		1.1
Total		$	137.1	$	41.8	$	95.3	$	134.8	$	35.3	$	99.5
* Not applicable, as these tradenames have an indefinite life.

Schedule of indefinite-lived intangible assets

	December 31, 2018							December 31, 2017
	Weighted Average Remaining Useful Life (Years)	Gross Value		Accumulated Amortization		Net Value		Gross Value		Accumulated Amortization		Net Value
Customer relationships	11.0	$	86.0	$	34.5	$	51.5	$	83.4	$	29.3	$	54.1
Indefinite-lived tradenames	*	24.1		*		24.1		23.7		*		23.7
Technology	16.5	22.9		4.1		18.8		23.6		3.0		20.6
Other	6.6	4.1		3.2		0.9		4.1		3.0		1.1
Total		$	137.1	$	41.8	$	95.3	$	134.8	$	35.3	$	99.5
* 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,
	2018		2017		2016
Amortization expense	$	6.9	$	6.6	$	6.1

Amortization for the next five years

We estimate amortization expense for the five years subsequent to December 31, 2018 as follows:

2019	$	6.2
2020	$	6.1
2021	$	6.1
2022	$	6.1
2023	$	6.1