Goodwill and Intangible Assets (Intangible Assets by Major Class) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	$ 65.2	$ 63.9
Finite-lived intangible assets, accumulated amortization	(44.9)	(42.2)
Finite-lived intangible assets, net	20.3	21.7
Patents and Licensing [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	19.6	18.2
Finite-lived intangible assets, accumulated amortization	(15.1)	(14.1)
Finite-lived intangible assets, net	4.5	4.1
In-Process Research and Development (IPR&D) [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	3.3	3.3
Finite-lived intangible assets, accumulated amortization	(1.2)	(1.0)
Finite-lived intangible assets, net	2.1	2.3
Trademarks [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	2.0	2.0
Finite-lived intangible assets, accumulated amortization	(1.8)	(1.7)
Finite-lived intangible assets, net	0.2	0.3
Customer Relationships [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	29.3	29.3
Finite-lived intangible assets, accumulated amortization	(20.0)	(19.1)
Finite-lived intangible assets, net	9.3	10.2
Customer Contracts [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	11.0	11.1
Finite-lived intangible assets, accumulated amortization	(6.8)	(6.3)
Finite-lived intangible assets, net	$ 4.2	$ 4.8