Earnings Per Share and Shareholders' Equity Transactions (Narrative) (Details) - USD ($) shares in Thousands				3 Months Ended	6 Months Ended
	May 11, 2021	Jan. 29, 2021	Oct. 29, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021
Accelerated Share Repurchase Agreement [Member]
Class Of Stock [Line Items]
Increase in repurchases common stock, authorized	$ 400,000,000
Stock repurchase program, available authorized repurchase amount						$ 405,000,000
October 2020 ASR [Member]
Class Of Stock [Line Items]
Amount paid by company			$ 100,000,000.0
Initial delivery of shares of common stock received			800
Shares repurchased under repurchase agreement, percentage			80.00%
Common stock shares received as final settlement of shares repurchased		45
Maximum [Member] | Accelerated Share Repurchase Agreement [Member]
Class Of Stock [Line Items]
Repurchases common stock, authorized						$ 1,300,000,000
Stock Compensation Plans [Member]
Class Of Stock [Line Items]
Antidilutive securities excluded from calculation of earnings per share				900	600