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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2017
Acquired finite-lived intangible assets:
Gross Value	$ 108.9		$ 108.9
Accumulated Amortization	(98.3)		(93.8)
Net Value	10.6		15.1
Total intangible assets: Gross Value	115.8		115.8
Total intangible assets: Net Value	17.5		22.0
Aggregate amortization expense for finite-lived intangible assets	4.5	$ 7.9
Trade names
Acquired finite-lived intangible assets:
Indefinite-lived trade names	6.9		6.9
Customer relationships
Acquired finite-lived intangible assets:
Gross Value	52.6		52.6
Accumulated Amortization	(50.2)		(49.1)
Net Value	2.4		3.5
Contracts and backlog
Acquired finite-lived intangible assets:
Gross Value	29.9		29.9
Accumulated Amortization	(26.0)		(24.8)
Net Value	3.9		5.1
Developed technology and technical know-how
Acquired finite-lived intangible assets:
Gross Value	25.0		25.0
Accumulated Amortization	(20.7)		(18.6)
Net Value	4.3		6.4
Trade names
Acquired finite-lived intangible assets:
Gross Value	1.4		1.4
Accumulated Amortization	(1.4)		(1.3)
Net Value	$ 0.0		$ 0.1

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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