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Equity - Summary of Capital Stock Activity (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]        
Common stock, shares issued (in shares) 185,983,792 185,983,792 185,983,792 185,983,792
Treasury Stock [Roll Forward]        
Treasury stock, shares, beginning (in shares) 56,859,498 53,702,178 51,653,236  
Stock options and awards (in shares) (677,827) (1,563,307) (390,553)  
Repurchases of common stock, net (in shares) 448,538 4,720,627 2,439,495  
Treasury stock, shares, ending (in shares) 56,630,209 56,859,498 53,702,178