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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]            
Dividends (in dollars per share) $ 0.40 $ 0.38 $ 1.20 $ 1.14    
Accounting Standards Update [Extensible List]         Accounting Standards Update 2019-12 [Member] Accounting Standards Update 2016-13 [Member]