Stockholders' Equity (Narrative) (Details) - USD ($)		12 Months Ended
	Apr. 23, 2020	May 31, 2020	Sep. 18, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock Issuance - Public Offering (in shares)	9,000,000	9,000,000.0
Stock issuance - Public Offering (9.0 shares)		$ 505,100,000
Share repurchase program, authorized amount			$ 500,000,000.0
Stock repurchase program, cumulative shares repurchased (in shares)		196,200,000
Stock repurchase program, cumulative shares retired (in shares)		184,900,000
Common Stock And Surplus
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock issuance - Public Offering (9.0 shares)	$ 505,100,000	$ 505,100,000