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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jan. 14, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]                        
Dividends declared per common share (in dollars per share)   $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.55 $ 0.55 $ 0.55 $ 0.55 $ 2.40 $ 2.20 $ 2.00
Subsequent Event                        
Subsequent Event [Line Items]                        
Dividends declared per common share (in dollars per share) $ 0.67                      
Dividends $ 10.8