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4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 04, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 10.7
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	501.0		$ 493.1
Accumulated Amortization	(361.6)		(360.0)
Net Carrying Amount	139.4		133.1
Amortization [Abstract]
Amortization expense	5.5	$ 7.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 12.0
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	87.2		88.7
Accumulated Amortization	(68.6)		(68.3)
Net Carrying Amount	18.6		20.4
Know how [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	199.2		190.6
Accumulated Amortization	(159.1)		(159.8)
Net Carrying Amount	40.1		30.8
Amortization [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				10.7
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	130.2		130.4
Accumulated Amortization	(87.8)		(86.6)
Net Carrying Amount	42.4		43.8
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	76.0		76.3
Accumulated Amortization	(41.6)		(40.9)
Net Carrying Amount	34.4		35.4
Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	3.9		3.9
Accumulated Amortization	(3.3)		(3.3)
Net Carrying Amount	0.6		0.6
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	4.5		3.2
Accumulated Amortization	(1.2)		(1.1)
Net Carrying Amount	$ 3.3		$ 2.1
Amortization [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 1.3
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)	3 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)	10 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)	6 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

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