Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies Improving the Presentation of Net Periodic Pension Cost (Details)

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Summary of Significant Accounting Policies Improving the Presentation of Net Periodic Pension Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 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 $ (0.1)   $ 0.2
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