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Business Combination (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Employee
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
[2]
Business Combination [Abstract]              
Net Sales   $ 464.1 $ 424.4 $ 1,360.1 $ 1,243.5    
Acquisition-related costs   0.3 $ 0.5 1.7 $ 2.8    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]              
Goodwill   808.1 [1]   808.1 [1]     $ 779.3
Sivomatic [Member]              
Business Combination [Abstract]              
Number of employees | Employee 115            
Net Sales | €           € 73  
Total consideration transferred, net of cash acquired $ 122.5            
Additional deferred tax liability 15.0            
Acquisition-related costs   $ 0.3   $ 1.7      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]              
Accounts receivable 24.4            
Inventories 15.6            
Other current assets 0.6            
Mineral rights 35.0            
Plant, property and equipment 38.0            
Goodwill 30.8            
Intangible assets 20.0            
Total assets acquired 164.4            
Current maturity of long term debt 5.7            
Accounts payable 9.0            
Accrued expenses 5.8            
Long term debt 5.1            
Non-current deferred tax liability 16.2            
Other non-current liabilities 0.1            
Total liabilities assumed 41.9            
Net assets acquired $ 122.5            
Sivomatic [Member] | Tradenames [Member] | Minimum [Member]              
Business Combination [Abstract]              
Estimated useful life of intangible assets acquired       25 years      
Sivomatic [Member] | Tradenames [Member] | Maximum [Member]              
Business Combination [Abstract]              
Estimated useful life of intangible assets acquired       30 years      
Sivomatic [Member] | Customer Relationships [Member] | Minimum [Member]              
Business Combination [Abstract]              
Estimated useful life of intangible assets acquired       25 years      
Sivomatic [Member] | Customer Relationships [Member] | Maximum [Member]              
Business Combination [Abstract]              
Estimated useful life of intangible assets acquired       30 years      
[1] Unaudited
[2] Condensed from audited financial statements