Goodwill and Intangible Assets (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Foreign currency translation gains (losses)	$ (0.3)	$ 0.9
Amortization expense	2.7	$ 2.4	$ 2.6
Estimated annual amortization expense, 2019	2.6
Estimated annual amortization expense, 2020	2.6
Estimated annual amortization expense, 2021	2.1
Estimated annual amortization expense, 2022	2.1
Estimated annual amortization expense, 2023	$ 2.1
2016 Restructuring Plan [Member] [Member]
Finite-Lived Intangible Assets [Line Items]
Asset impairment charges, patent			2.8
Asset impairment charges, trademark			$ 10.0