XML 51 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
Materials Technologies Separation (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 01, 2016
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]            
Income (loss) from discontinued operations, net of tax   $ 0.0 $ 1,825.6 $ (1.0) $ 1,873.8  
Business separation costs, legal and advisory fees, before tax   0.0 0.0 0.0 32.5  
Materials Technologies            
Restructuring Cost and Reserve [Line Items]            
Net business separation costs     0.0 0.0 30.2  
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 0.0 $ 0.0  
Assets of discontinued operations   0.0   0.0   $ 0.0
Liabilities of discontinued operations   $ 0.0   $ 0.0   $ 0.0