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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share The weighted average number of shares outstanding used to compute earnings per common share were as follows (in millions):
202120202019
Weighted average common shares outstanding for basic computations276.4 280.0 282.0 
Weighted average dilutive effect of equity awards1.0 1.2 1.8 
Weighted average common shares outstanding for diluted computations277.4 281.2 283.8