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Subsequent Event (Details) - USD ($)
3 Months Ended
Oct. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Oct. 31, 2019
Jun. 30, 2019
Subsequent Event [Line Items]          
Dividends declared per common share (in dollars per share)   $ 0.1746 $ 0.1518    
Long-term debt   $ 2,635,000,000     $ 2,637,500,000
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared per common share (in dollars per share) $ 0.1746        
Line of Credit | Revolver          
Subsequent Event [Line Items]          
Credit agreement, maximum capacity   450,000,000      
Long-term debt   $ 0 $ 0   $ 0
Line of Credit | Revolver | Subsequent Event          
Subsequent Event [Line Items]          
Credit agreement, maximum capacity       $ 750,000,000