Summary of Significant Accounting Policies Improving the Presentation of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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		$ (0.1)
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