Related Party Transactions and Transactions with Air Products (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 01, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Amount of additional fees due over cost (as percent)	5.00%
Minimum
Related Party Transaction [Line Items]
Transition services agreement term	12 months
Maximum
Related Party Transaction [Line Items]
Transition services agreement term	24 months
Air Products
Related Party Transaction [Line Items]
Total Allocated Costs		$ 0.0	$ 5.2	$ 0.0	$ 15.6
Air Products | Cost of sales
Related Party Transaction [Line Items]
Total Allocated Costs		0.0	0.7	0.0	2.2
Air Products | Selling and administrative
Related Party Transaction [Line Items]
Total Allocated Costs		0.0	4.0	0.0	12.1
Air Products | Research and development
Related Party Transaction [Line Items]
Total Allocated Costs		0.0	0.3	0.0	0.8
Air Products | Business restructuring and cost reduction actions
Related Party Transaction [Line Items]
Total Allocated Costs		$ 0.0	$ 0.2	$ 0.0	$ 0.5