Goodwill and Intangible Assets (Intangible Assets by Major Class) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	$ 63.9	$ 63.1
Finite-lived intangible assets, accumulated amortization	(42.2)	(39.8)
Finite-lived intangible assets, net	21.7	23.3
Patents and Licensing [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	18.2	17.8
Finite-lived intangible assets, accumulated amortization	(14.1)	(13.4)
Finite-lived intangible assets, net	4.1	4.4
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	(1.0)	(0.7)
Finite-lived intangible assets, net	2.3	2.6
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	(1.7)	(1.6)
Finite-lived intangible assets, net	0.3	0.4
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	(19.1)	(18.3)
Finite-lived intangible assets, net	10.2	11.0
Customer Contracts [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, gross	11.1	10.7
Finite-lived intangible assets, accumulated amortization	(6.3)	(5.8)
Finite-lived intangible assets, net	$ 4.8	$ 4.9