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Quarterly Financial Information (Unaudited)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
QUARTERLY FINANCIAL INFORMATION (UNAUDITED) QUARTERLY FINANCIAL INFORMATION (Unaudited)
(in millions, except per share amounts)First QuarterSecond QuarterThird QuarterFourth QuarterTotal
2020
Operating revenues$2,108.6 $1,548.7 $1,651.0 $1,933.4 $7,241.7 
Operating income626.6 338.8 370.2 370.5 1,706.1 
Net income attributed to common shareholders452.5 241.6 266.8 239.0 1,199.9 
Earnings per share (1)
Basic$1.43 $0.77 $0.85 $0.76 $3.80 
Diluted1.43 0.76 0.84 0.76 3.79 
2019
Operating revenues$2,377.4 $1,590.2 $1,608.0 $1,947.5 $7,523.1 
Operating income542.8 314.6 310.9 363.1 1,531.4 
Net income attributed to common shareholders420.1 235.7 234.3 243.9 1,134.0 
Earnings per share (1)
Basic$1.33 $0.75 $0.74 $0.77 $3.60 
Diluted1.33 0.74 0.74 0.77 3.58 

(1)    Earnings per share for the individual quarters may not total the year ended earnings per share amount because of changes to the average number of shares outstanding and changes in incremental issuable shares throughout the year.