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3. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 500.3		$ 500.3		$ 509.0
Accumulated Amortization	(349.6)		(349.6)		(334.9)
Net Carrying Amount	150.7		150.7		174.1
Amortization [Abstract]
Amortization expense	7.0	$ 7.8	21.8	$ 23.4
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	89.1		89.1		92.3
Accumulated Amortization	(67.0)		(67.0)		(64.4)
Net Carrying Amount	22.1		22.1		27.9
Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	191.7		191.7		194.9
Accumulated Amortization	(159.7)		(159.7)		(157.9)
Net Carrying Amount	32.0		32.0		37.0
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	131.3		131.3		133.3
Accumulated Amortization	(76.1)		(76.1)		(70.3)
Net Carrying Amount	55.2		55.2		63.0
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	76.4		76.4		76.7
Accumulated Amortization	(39.7)		(39.7)		(36.0)
Net Carrying Amount	36.7		36.7		40.7
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	3.9		3.9		3.9
Accumulated Amortization	(3.2)		(3.2)		(3.0)
Net Carrying Amount	0.7		0.7		0.9
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	7.9		7.9		7.9
Accumulated Amortization	(3.9)		(3.9)		(3.3)
Net Carrying Amount	$ 4.0		$ 4.0		$ 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)			2 years		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)			2 years		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)			7 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

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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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