Shareholders' Equity (Narrative) (Details) - USD ($)			1 Months Ended			3 Months Ended		6 Months Ended		59 Months Ended
	Jul. 21, 2021	Jul. 29, 2016	Aug. 30, 2021	Apr. 30, 2021	Feb. 28, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	May 30, 2021	Mar. 31, 2021
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, repurchased cost						$ 20,000,000.0		$ 30,000,000.0	$ 34,400,000
Quarterly dividends declared				$ 0.21	$ 0.21
Dividends declared				$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.42	$ 0.40
Dividends payable, date to be paid, year and month											2021-05	2021-03
Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Quarterly dividends declared	$ 0.21
Scenario Forecast [Member]
Equity Class Of Treasury Stock [Line Items]
Dividends declared			$ 0.21
Dividends payable, date to be paid, year and month			2021-08
Common Stock
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date		Dec. 31, 2023
Stock repurchase program, remaining authorized repurchase amount						$ 563,800,000		$ 563,800,000		$ 563,800,000
Shares repurchase program, shares repurchased						194,458		320,093	382,170
Common Stock | Share Repurchase Program Excluding Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased								300,000
Shares repurchase program, repurchased cost								$ 30,000,000.0
Shares repurchase program, average price per share								$ 93.72
Common Stock | Share Repurchase Program Including Accelerated Share Repurchase
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased										10,000,000.0
Shares repurchase program, repurchased cost										$ 636,200,000
Shares repurchase program, average price per share										$ 63.35
Common Stock | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount		$ 1,200,000,000.0