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New Accounting Guidance (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities $ (17.9) $ (17.0)
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member] | Discontinued Operations [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities 0.0 (9.6)
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities 17.9 17.0
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member] | Discontinued Operations [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities 0.0 $ 9.6
Accounting Standards Update 2015-17 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase in noncurrent deferred tax assets 13.7  
Decrease in noncurrent deferred tax liabilities $ 99.9