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New Accounting Guidance (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cash provided by operating activities $ 655.2 $ 560.0  
Cash provided by investing activities $ (226.5) (480.8)  
Accounting Standards Update 2016-15 [Member]      
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 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative-effect adjustment related to adoption of new accounting standard     $ (17.1)