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New Accounting Guidance (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash provided by operating activities $ 1,285.8 $ 1,106.0  
Cash provided by investing activities $ (882.1) (540.8)  
Accounting Standards Update 2016-15      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash provided by operating activities   (4.1)  
Cash provided by investing activities   $ 4.1  
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)