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Summary of Significant Accounting Policies (Other Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of businesses     $ 1.0 $ 4.5
Gain (Loss) on Disposition of Business   $ 1.0    
MEMS [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (Loss) on Disposition of Business $ 23.4      
Non-Cash Loss Reserve for Assets 20.4      
Professional Fees $ 3.0