Summary of Significant Accounting Policies Improving the Presentation of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
2017 Periodic Pension Cost Restatement		$ (0.2)
Accounting Standards Update 2017-07 [Member] | Cost of Goods, Total [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
2017 Periodic Pension Cost Restatement	$ 0.2		$ 0.4
Accounting Standards Update 2017-07 [Member] | Operating expense
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
2017 Periodic Pension Cost Restatement	$ (0.1)		$ (0.2)