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Materials Technologies Separation (Narrative) (Details)
$ in Millions
3 Months Ended
Oct. 01, 2016
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]        
Income (Loss) From Discontinued Operations, net of tax   $ (1.0) $ 48.2  
Business separation costs, legal and advisory fees, before tax   0.0 32.5  
Materials Technologies        
Restructuring Cost and Reserve [Line Items]        
Net business separation costs   0.0 30.2  
Tax expense related to changes in tax positions on business separation activities     2.7  
Materials Technologies | Business separation costs        
Restructuring Cost and Reserve [Line Items]        
Business separation costs, legal and advisory fees, before tax     32.5  
Materials Technologies | Other non-operating income (expense), net        
Restructuring Cost and Reserve [Line Items]        
Pension settlement benefit     2.3  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Electronic Materials Division (EMD)        
Restructuring Cost and Reserve [Line Items]        
Distribution ratio of common stock in spin-off 0.5      
Discontinued Operations | Electronic Materials Division (EMD)        
Restructuring Cost and Reserve [Line Items]        
Income (Loss) From Discontinued Operations, net of tax   0.0 $ 0.0  
Assets of discontinued operations   0.0   $ 0.0
Liabilities of discontinued operations   $ 0.0   $ 0.0