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Net Income per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computations of Net Income per Common Share
The computations of net income per common share are presented in the following table.

TABLE 99: NET INCOME PER COMMON SHARE
FOR THE YEAR ENDED DECEMBER 31,
($ In Millions Except Per Common Share Information)202020192018
BASIC NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding208,319,412 214,525,547 223,148,335 
Net Income$1,209.3 $1,492.2 $1,556.4 
Less: Dividends on Preferred Stock56.2 46.4 46.4 
Net Income Applicable to Common Stock1,153.1 1,445.8 1,510.0 
Less: Earnings Allocated to Participating Securities12.1 16.9 20.1 
Earnings Allocated to Common Shares Outstanding$1,141.0 $1,428.9 $1,489.9 
Basic Net Income Per Common Share5.48 6.66 6.68 
DILUTED NET INCOME PER COMMON SHARE
Average Number of Common Shares Outstanding208,319,412 214,525,547 223,148,335 
Plus Dilutive Effect of Share-based Compensation688,574 1,075,602 1,339,991 
Average Common and Potential Common Shares209,007,986 215,601,149 224,488,326 
Earnings Allocated to Common and Potential Common Shares$1,141.1 $1,428.9 $1,490.0 
Diluted Net Income Per Common Share5.46 6.63 6.64 
Note: For the years ended December 31, 2020, 2019, and 2018, there were no common stock equivalents excluded in the computation of diluted net income per share.