Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Denominator
Basic Average Common Shares Outstanding	392,657	383,062
Dilutive potential common shares
Shares contingently issuable under employee stock plans	630	845
Shares restricted under stock plans	288	207
Forward agreements	337	0
Diluted Average Common Shares	393,912	384,114