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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared per share (in dollars per share) $ 1.08 $ 0.90 $ 3.24 $ 2.70
Special cash dividends declared per share (in dollars per share)     $ 3.00