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Income Taxes (Deferred Tax Assets and Liabilities Included in Consolidated Financials) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Deferred Tax Assets    
Other noncurrent assets $ 115.2 $ 121.4
Deferred Tax Liabilities    
Deferred income taxes 793.8 775.1
Net Deferred Income Tax Liability $ 678.6 $ 653.7