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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 17, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]        
Dividends declared per common share (in dollars per share)   $ 1.8 $ 1.6 $ 1.4
Subsequent Event        
Subsequent Event [Line Items]        
Dividends declared per common share (in dollars per share) $ 0.50      
Dividends $ 8.8