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4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Mar. 04, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period		$ 15.6		$ 15.6
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 496.9			496.9		$ 493.1
Accumulated Amortization	(369.6)			(369.6)		(360.0)
Net Carrying Amount	127.3			127.3		133.1
Amortization [Abstract]
Amortization expense	5.6		$ 7.4	11.1	$ 14.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles							$ 5.5
Intangible Assets, Gross (Excluding Goodwill)	497.1			497.1
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	88.4			88.4		88.7
Accumulated Amortization	(71.2)			(71.2)		(68.3)
Net Carrying Amount	17.2			17.2		20.4
Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	189.8			189.8		190.6
Accumulated Amortization	(161.4)			(161.4)		(159.8)
Net Carrying Amount	28.4			28.4		30.8
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	135.5			135.5		130.4
Accumulated Amortization	(89.8)			(89.8)		(86.6)
Net Carrying Amount	45.7			45.7		43.8
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	76.2			76.2		76.3
Accumulated Amortization	(42.6)			(42.6)		(40.9)
Net Carrying Amount	33.6			33.6		35.4
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	3.9			3.9		3.9
Accumulated Amortization	(3.4)			(3.4)		(3.3)
Net Carrying Amount	0.5			0.5		0.6
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	3.1			3.1		3.2
Accumulated Amortization	(1.2)			(1.2)		(1.1)
Net Carrying Amount	1.9			$ 1.9		$ 2.1
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)				6 years		7 years
Minimum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				2 years		2 years
Minimum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				7 years		7 years
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)				6 years		6 years
Maximum [Member] | Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				7 years		7 years
Maximum [Member] | Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				10 years		10 years
Maximum [Member] | Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				10 years		11 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				5 years		6 years
Maximum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				7 years		7 years
Maximum [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Average Remaining Life (years)				0 years		0 years
In Process Research and Development [Member]
Amortization [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 0.2			$ 0.2

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