4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Oct. 01, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 29.4		$ 29.4
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	588.6		588.6		$ 525.6
Accumulated Amortization	(382.0)		(382.0)		(380.3)
Net Carrying Amount	206.6		206.6		145.3
Amortization [Abstract]
Amortization expense	7.2	$ 5.6	13.1	$ 11.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 3.4
Intangible Assets, Gross (Excluding Goodwill)	593.4		$ 593.4		$ 525.8
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			5 years 10 months 6 days		6 years 4 months 9 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	109.9		$ 109.9		$ 107.2
Accumulated Amortization	(77.4)		(77.4)		(74.3)
Net Carrying Amount	32.5		$ 32.5		$ 32.9
Know How [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			5 years 3 months		5 years 8 months 15 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	188.7		$ 188.7		$ 188.5
Accumulated Amortization	(165.3)		(165.3)		(162.6)
Net Carrying Amount	23.4		$ 23.4		$ 25.9
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			14 years 4 months 24 days		8 years 3 months 21 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	213.0		$ 213.0		$ 144.2
Accumulated Amortization	(97.6)		(97.6)		(93.9)
Net Carrying Amount	115.4		$ 115.4		$ 50.3
Licensing Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			8 years 3 months		8 years 8 months 26 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	66.0		$ 66.0		$ 76.0
Accumulated Amortization	(36.2)		(36.2)		(44.4)
Net Carrying Amount	29.8		$ 29.8		$ 31.6
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			8 years 2 months 1 day		8 years 6 months
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	6.4		$ 6.4		$ 6.4
Accumulated Amortization	(3.8)		(3.8)		(3.6)
Net Carrying Amount	2.6		$ 2.6		$ 2.8
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			4 years 3 months 18 days		6 years 3 days
Finite-Lived Intangible Assets, Net [Abstract]
Purchase Price	4.5		$ 4.5		$ 3.2
Accumulated Amortization	(1.6)		(1.6)		(1.4)
Net Carrying Amount	2.9		$ 2.9		$ 1.8
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		$ 0.1
Accumulated Amortization	(0.1)		(0.1)		(0.1)
Net Carrying Amount	0.0		0.0		0.0
In Process Research and Development [Member]
Amortization [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 4.8		$ 4.8		$ 0.2