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3. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 598.5		$ 608.1
Accumulated Amortization	(411.3)		(413.4)
Net Carrying Amount	187.2		194.7
Amortization [Abstract]
Amortization expense	7.2	$ 5.9
Intangible Assets, Gross (Excluding Goodwill)	$ 603.1		$ 612.9
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 5 months 19 days		5 years 6 months 3 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 112.4		$ 116.6
Accumulated Amortization	(85.6)		(87.2)
Net Carrying Amount	$ 26.8		$ 29.4
Know How [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	4 years 6 months		4 years 9 months
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 192.7		$ 196.6
Accumulated Amortization	(172.6)		(175.4)
Net Carrying Amount	$ 20.1		$ 21.2
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	13 years 9 months 29 days		14 years
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 217.1		$ 218.1
Accumulated Amortization	(108.6)		(107.1)
Net Carrying Amount	$ 108.5		$ 111.0
Licensing Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 6 months 3 days		7 years 8 months 23 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 65.2		$ 65.6
Accumulated Amortization	(38.0)		(37.4)
Net Carrying Amount	$ 27.2		$ 28.2
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	7 years 8 months 15 days		7 years 9 months 25 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 6.4		$ 6.6
Accumulated Amortization	(4.2)		(4.2)
Net Carrying Amount	$ 2.2		$ 2.4
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	3 years 7 months 28 days		3 years 10 months 13 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 4.6		$ 4.5
Accumulated Amortization	(2.2)		(2.0)
Net Carrying Amount	$ 2.4		$ 2.5
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	$ 0.1		$ 0.1
Accumulated Amortization	(0.1)		(0.1)
Net Carrying Amount	0.0		0.0
In Process Research and Development [Member]
Amortization [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 4.6		$ 4.8

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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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