Commitments and Contingencies (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 13.3	$ 11.7	$ 10.5
Outstanding unconditional contractual commitments for the purchase of raw materials, utilities and equipment	75.6
Outstanding uncondintional contractual commitments due to be paid in 2015	$ 5.3
Contingent consideration, payable period	5 years
Contingent consideration, estimated outcome, low	$ 0.0
Contingent consideration, estimated outcome, high	5.5
Insurance Claims [Member]
Operating Leased Assets [Line Items]
Accrual for insurance obligations	3.8
Amount reimbursable by the insurance company	$ 0.9