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Materials Technologies Separation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
May 06, 2016
Restructuring Cost and Reserve [Line Items]                        
Business separation costs, before tax $ 21.7 [1] $ 9.5 [1] $ 7.4 [1] $ 12.0 [1] $ 7.5 [1] $ 0.0 [1] $ 0.0 [1] $ 0.0 [1] $ 50.6 [1] $ 7.5 [1] $ 0.0  
Business separation additional income tax expense                 51.8      
Foreign earnings repatriated                 443.8      
Loss on extinguishment of debt 6.9 [2] $ 0.0 [2] $ 0.0 [2] $ 0.0 [2] $ 16.6 [2] $ 0.0 [2] $ 0.0 [2] $ 0.0 [2] 6.9 [2] $ 16.6 [2] $ 0.0  
Versum Financing [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Cash to be received at spin-off 550.0               550.0      
Extinguishment of debt amount                 418.3      
Loss on extinguishment of debt                 6.9      
Loss on extinguishment of debt, net of tax                 $ 4.3      
Loss on extinguishment of debt, per share, net of tax                 $ 0.02      
Versum Financing [Member] | Senior Note 5.5% [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Senior notes $ 425.0               $ 425.0      
Interest rate of debt, stated percentage 5.50%               5.50%      
Debt instrument, maturity date                 Sep. 30, 2024      
Versum Financing [Member] | Term Loan B 3.346% [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Debt instrument, maturity date                 Sep. 30, 2023      
Debt instrument, principal amount $ 575.0               $ 575.0      
Versum Financing [Member] | Revolving Credit Facility [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Credit facility, maximum borrowing capacity 200.0               $ 200.0      
Credit facility, expiration date                 Sep. 30, 2021      
Net leverage ratio covenant (total debt net of cash on hand to total adjusted EBITDA)                 325.00%      
Credit facility, amount borrowed and outstanding $ 0.0               $ 0.0      
Versum Financing [Member] | Revolving Credit Facility [Member] | LIBOR [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Basis spread on variable rate                 2.00%      
Versum Financing [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Basis spread on variable rate                 1.00%      
Versum Financing [Member] | Term Facility [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Term facility, percent original principal annual amortization                 1.00%      
Versum Financing [Member] | Term Facility [Member] | LIBOR [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Basis spread on variable rate                 2.50%      
Versum Financing [Member] | Term Facility [Member] | LIBOR [Member] | Minimum [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Interest rate of debt, stated percentage 0.75%               0.75%      
Versum Financing [Member] | Term Facility [Member] | Base Rate [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Basis spread on variable rate                 1.50%      
Versum Financing [Member] | Term Facility [Member] | Base Rate [Member] | Minimum [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Interest rate of debt, stated percentage 1.75%               1.75%      
Materials Technologies [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Business separation costs, before tax                 $ 50.6      
Business separation costs, after tax                 $ 46.7      
Business separation costs, after-tax, per share                 $ 0.21      
Business separation additional income tax expense                 $ 51.8      
Business separation additional income tax expense, per share                 $ 0.24      
Performance Materials [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Definitive agreement expected cash consideration                       $ 3,800.0
Electronic Materials [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Income tax provision on repatriation of foreign earnings                 $ 45.7      
Foreign earnings repatriated                 $ 443.8      
[1] For additional information, see Note 3, Materials Technologies Separation.
[2] For additional information, see Note 15, Debt.