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3. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 515.9		$ 509.0
Accumulated Amortization	(347.7)		(334.9)
Net Carrying Amount	168.2		174.1
Amortization [Abstract]
Amortization expense	7.4	$ 6.9
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	94.3		92.3
Accumulated Amortization	(67.5)		(64.4)
Net Carrying Amount	26.8		27.9
Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	197.5		194.9
Accumulated Amortization	(162.1)		(157.9)
Net Carrying Amount	35.4		37.0
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	135.1		133.3
Accumulated Amortization	(73.9)		(70.3)
Net Carrying Amount	61.2		63.0
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	77.0		76.7
Accumulated Amortization	(37.5)		(36.0)
Net Carrying Amount	39.5		40.7
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	4.1		3.9
Accumulated Amortization	(3.2)		(3.0)
Net Carrying Amount	0.9		0.9
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	7.9		7.9
Accumulated Amortization	(3.5)		(3.3)
Net Carrying Amount	$ 4.4		$ 4.6
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	1 year	1 year
Minimum [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	0 years	0 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	7 years	7 years
Maximum [Member] | Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	8 years	8 years
Maximum [Member] | Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	11 years	12 years
Maximum [Member] | Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	11 years	12 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	6 years	6 years
Maximum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	8 years	8 years
Maximum [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)	0 years	0 years

X

- References

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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