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Commitments, Contingencies and Litigation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2011
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Environmental Remediation          
Rent expense   $ 6.1   $ 19.2  
Ashland | Other Retained Remediation Liabilities          
Environmental Remediation          
Remediation indemnification obligation resulting from breach of any representation, warranty or covenant individual claim threshold $ 0.2        
Remediation indemnification obligation resulting from breach of any representation, warranty or covenant aggregate claim deductible $ 5.0        
Successor          
Environmental Remediation          
Rent expense     $ 0.6   $ 0.6
Predecessor          
Environmental Remediation          
Rent expense     $ 4.9   $ 17.1