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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 15, 2019
Mar. 31, 2019
Mar. 31, 2018
Subsequent Event [Line Items]      
Cash dividends declared (in dollars per share)   $ 0.60 $ 0.55
Subsequent Event      
Subsequent Event [Line Items]      
Cash dividends declared (in dollars per share) $ 0.60    
Cash dividends declared $ 9.8