Shareholders' Equity (Narrative) (Details) - USD ($)			1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 19, 2022	Jul. 29, 2016	Jul. 31, 2022	Apr. 30, 2022	Feb. 28, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Nov. 30, 2022	Aug. 31, 2022	May 31, 2022	Mar. 31, 2022
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, repurchased cost						$ 60,000,000.0	$ 20,000,000.0	$ 145,000,000.0	$ 50,000,000.0
Quarterly dividends declared			$ 0.231	$ 0.231	$ 0.231
Dividends declared						$ 0.231	$ 0.21	$ 0.693	$ 0.63
Dividends payable, date to be paid, year and month											2022-08	2022-05	2022-03
Scenario Forecast [Member]
Equity Class Of Treasury Stock [Line Items]
Dividends declared	$ 0.254
Dividends payable, date to be paid, year and month										2022-11
Common Stock
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date		Dec. 31, 2023
Stock repurchase program, remaining authorized repurchase amount						$ 368,800,000		$ 368,800,000
Shares repurchase program, shares repurchased						(696,795)	(186,929)	(1,636,950)	(507,022)
Common Stock | Share Repurchase Program Excluding Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased						700,000		1,600,000
Shares repurchase program, repurchased cost						$ 60,000,000.0		$ 145,000,000.0
Shares repurchase program, average price per share						$ 86.11		$ 88.58
Common Stock | Share Repurchase Program Including Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased								12,100,000
Shares repurchase program, repurchased cost								$ 831,200,000
Shares repurchase program, average price per share								$ 68.45
Common Stock | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount		$ 1,200,000,000.0