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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Subsequent Event [Line Items]        
Cash dividends declared per common share (in dollars per share)   $ 0.21 $ 0.18 $ 0.63
Subsequent Event        
Subsequent Event [Line Items]        
Cash dividends declared per common share (in dollars per share) $ 0.22      
Dividends $ 10.2      
Dividends, Percent Increase 5.00%