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Earnings per Common Share - Textual (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 15, 2019
Feb. 21, 2019
Jan. 15, 2019
Oct. 26, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]              
Cash dividends per common share, Declared (in dollars per share)         $ 0.27 $ 0.25  
Common Stock              
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]              
Cash dividends per common share, Declared (in dollars per share)   $ 0.27   $ 0.27      
Cash dividends per common share, Paid (in dollars per share)     $ 0.27        
Common stock dividends accrued         $ 27.8   $ 28.4
Subsequent Event [Member] | Common Stock              
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]              
Cash dividends per common share, Paid (in dollars per share) $ 0.27