Condensed Consolidated Statements Of Income (Parenthetical) - shares shares in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock dividend			5.00%
Average common shares outstanding	[1]	22.6	22.7	22.6
As Reported [Member]
Average common shares outstanding		21.5		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 21.5 million and 21.6 million for the three and six months ended June 30, 2019, respectively.