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Commitments and Contingencies (Textuals) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 14.5 $ 13.3 $ 11.7
Outstanding unconditional contractual commitments for the purchase of raw materials, utilities and equipment 72.7    
Outstanding uncondintional contractual commitments due to be paid in 2019 $ 14.0    
Contingent consideration, payable period 5 years    
Contingent consideration, estimated outcome, low $ 0.0    
Contingent consideration, estimated outcome, high 2.1    
Insurance Claims [Member]      
Operating Leased Assets [Line Items]      
Accrual for insurance obligations 3.4    
Amount reimbursable by the insurance company 0.9    
Revolving credit facility, due 2020 [Member] | Letter of Credit [Member]      
Operating Leased Assets [Line Items]      
Letters of credit supporting the reimbursement of workers' compensation and other claims $ 2.5