Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Amortized Intangible Assets

The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):

	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets
Advanced Materials & Structures
Customer relationships	$	276.3	$	67.7	$	—	$	1.8	$	206.8
Developed technology	34.0		10.9		—		0.4		22.7
Trade names	21.8		0.8		20.7		0.3		—
Non-compete agreements	2.9		2.2		—		—		0.7
Patents	1.5		0.4		—		—		1.1
Total	$	336.5	$	82.0	$	20.7	$	2.5	$	231.3
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names	$	20.0	$	—	$	0.1	$	—	$	19.9

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange			Net Carrying Amount
Amortized Intangible Assets
Advanced Materials & Structures
Customer relationships	$	276.3	$	50.4	$	—	$	0.7		$	225.2
Developed technology	34.0		8.5		—		0.2			25.3
Trade names	21.8		0.8		20.7		0.3			—
Non-compete agreements	2.9		1.7		—		—			1.2
Patents	1.5		0.4		—		—			1.1
Total	$	336.5	$	61.8	$	20.7	$	1.2		$	252.8
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names	$	20.0	$	—	$	0.1	$	(0.1	)	$	20.0

Schedule of Unamortized Intangible Assets

The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):

	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets
Advanced Materials & Structures
Customer relationships	$	276.3	$	67.7	$	—	$	1.8	$	206.8
Developed technology	34.0		10.9		—		0.4		22.7
Trade names	21.8		0.8		20.7		0.3		—
Non-compete agreements	2.9		2.2		—		—		0.7
Patents	1.5		0.4		—		—		1.1
Total	$	336.5	$	82.0	$	20.7	$	2.5	$	231.3
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names	$	20.0	$	—	$	0.1	$	—	$	19.9

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange			Net Carrying Amount
Amortized Intangible Assets
Advanced Materials & Structures
Customer relationships	$	276.3	$	50.4	$	—	$	0.7		$	225.2
Developed technology	34.0		8.5		—		0.2			25.3
Trade names	21.8		0.8		20.7		0.3			—
Non-compete agreements	2.9		1.7		—		—			1.2
Patents	1.5		0.4		—		—			1.1
Total	$	336.5	$	61.8	$	20.7	$	1.2		$	252.8
Unamortized Intangible Assets (Advanced Materials & Structures)
Trade names	$	20.0	$	—	$	0.1	$	(0.1	)	$	20.0

Schedule of Future Amortization Expense

The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):

For the year ending December 31,	Estimated Amortization Expense
2020	$	19.9
2021	19.9
2022	19.9
2023	19.6
2024	19.2