Shareholders' Equity (Narrative) (Details) - USD ($)			1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 19, 2023	Jul. 29, 2016	Apr. 30, 2023	Feb. 28, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jul. 18, 2023	May 31, 2023	Mar. 31, 2023
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, repurchased cost					$ 30,300,000	$ 55,000,000	$ 57,600,000	$ 85,000,000
Quarterly dividends declared			$ 0.254	$ 0.254
Dividends payable, date to be paid, year and month										2023-05	2023-03
Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Quarterly dividends declared	$ 0.254
Dividends payable, date to be paid, year and month	2023-08
Common Stock
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date		Dec. 31, 2023
Stock repurchase program, remaining authorized repurchase amount					$ 291,800,000		$ 291,800,000
Shares repurchase program, shares repurchased					(443,376)	(639,150)	(810,645)	(940,155)
Common Stock | Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount									$ 1,700,000,000
Common Stock | Share Repurchase Program Excluding Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased					400,000		800,000
Shares repurchase program, repurchased cost					$ 30,000,000		$ 57,000,000
Shares repurchase program, average price per share					$ 67.66		$ 70.31
Common Stock | Share Repurchase Program Including Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased							13,200,000
Shares repurchase program, repurchased cost							$ 908,200,000
Shares repurchase program, average price per share							$ 68.76
July 2018 program | Common Stock
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date		Jul. 31, 2018
July 2018 program | Common Stock | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount		$ 150,000,000
December 2023 program | Common Stock | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount		$ 1,200,000,000
December 2026 program | Common Stock | Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount									$ 500,000,000