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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 29, 2020
Jul. 01, 2020
Jun. 12, 2020
Mar. 13, 2020
Subsequent event        
Quarterly cash dividend declared (in dollars per share)     $ 0.16 $ 0.16
Subsequent event        
Subsequent event        
Dividends payable date declared Jul. 29, 2020      
Quarterly cash dividend declared (in dollars per share) $ 0.16      
Dividends payable date to be paid Sep. 18, 2020      
Dividends payable date of record Aug. 28, 2020      
Carthage Crushed Limestone | Subsequent event        
Subsequent event        
Cash paid for acquisition   $ 9