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Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Net Income per Common Share
The computations of net income per common share are presented in the following table.
TABLE 61: NET INCOME PER COMMON SHARE
THREE MONTHS ENDED MARCH 31,
($ In Millions Except Per Common Share Information)20212020
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding208,112,824 208,881,131 
Net Income$375.1 $360.6 
Less: Dividends on Preferred Stock16.2 30.5 
Net Income Applicable to Common Stock358.9 330.1 
Less: Earnings Allocated to Participating Securities3.7 3.9 
Earnings Allocated to Common Shares Outstanding355.2 326.2 
Basic Net Income Per Common Share$1.71 $1.56 
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding208,112,824 208,881,131 
Plus: Dilutive Effect of Share-based Compensation833,624 935,691 
Average Common and Potential Common Shares208,946,448 209,816,822 
Earnings Allocated to Common and Potential Common Shares$355.2 $326.2 
Diluted Net Income Per Common Share1.70 1.55 
Note:    For the three months ended March 31, 2021 and 2020, there were no common stock equivalents excluded in the computation of diluted net income per share.