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New Accounting Guidance (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash provided by operating activities $ 2,003.4 $ 1,856.2  
Cash provided by investing activities $ (1,435.5) (1,031.8)  
Accounting Standards Update 2016-15      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash provided by operating activities   (7.1)  
Cash provided by investing activities   $ 7.1  
Accounting Standards Update 2016-16      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative-effect adjustment related to adoption of new accounting standard     $ (17.1)