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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 26, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Subsequent Event [Line Items]        
Cash dividends declared per common share (in dollars per share)   $ 0.22 $ 0.21 $ 0.66
Subsequent Event        
Subsequent Event [Line Items]        
Cash dividends declared per common share (in dollars per share) $ 0.23      
Dividends $ 10.2