Condensed Consolidated Statements Of Income (Parenthetical) - shares shares in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Stock dividend		5.00%
Average common shares outstanding	[1]	22.7	22.7
As Reported [Member]
Average common shares outstanding			21.6

[1] Adjusted for the declaration of a 5% stock dividend in 2019, shares related to which were issued in February 2020.  Prior to the adjustment, the average common shares outstanding were 21.6 million for the three months ended March 31, 2019.