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Supplemental Information (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2017
Jul. 20, 2017
Jun. 30, 2017
Jun. 30, 2016
Mar. 30, 2017
Supplemental Information [Abstract]          
Income tax payments, net of refunds     $ 1,109.8 $ 330.1  
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividend declared, per share   $ 0.95      
Dividends payable, date to be paid   Nov. 13, 2017      
Dividends payable, date of record   Oct. 10, 2017      
Revolving Credit Facility [Member] | Credit Agreement 2017 [Member]          
Debt Instrument [Line Items]          
Credit facility, initiation date Mar. 31, 2017        
Term of credit facility (in years) 5 years        
Credit facility, maximum borrowing capacity $ 2,500.0        
Debt covenant, maximum ratio of total debt to capitalization 70.00%        
Credit facility, amount outstanding     $ 0.0    
Revolving Credit Facility [Member] | Credit Agreement 2013 [Member]          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity         $ 2,690.0
Credit facility, amount outstanding $ 0.0        
Credit facility, expiration date Apr. 30, 2018        
Credit facility, early termination fees $ 0.0