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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 21, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]          
Stock repurchased (in shares)       9.0  
Common stock issued under stock compensation plan (in shares)       1.8  
Net decrease in period (in shares)       7.2  
Dividends declared (in dollars per share)   $ 0.120 $ 0.12 $ 0.360 $ 0.36
Subsequent Event          
Class of Stock [Line Items]          
Dividends declared $ 28.4