Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 28.6	$ 27.1
Accumulated Amortization	(21.3)	(20.9)
Net Amount	7.3	6.2
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	15.9	15.9
Accumulated Amortization	(14.9)	(14.6)
Net Amount	1.0	1.3
Patents and Others [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12.7	11.2
Accumulated Amortization	(6.4)	(6.3)
Net Amount	$ 6.3	$ 4.9