Consolidated Statements Of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated other Comprehensive Income (Loss)	Non Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,144.8	$ 0.6	$ 983.9	$ 218.4	$ (58.4)	$ 0.3
Beginning Balance (in shares) at Dec. 31, 2020		61.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee stock compensation	62.7		62.7
Deferred compensation	1.1		1.3	(0.2)
Employee stock compensation (in shares)		0.5
Proceeds from stock issuances under employee plans	156.1		156.1
Proceeds from stock issuances under employee plans (in shares)		1.8
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively)	(153.4)			153.4
Repurchase and retirement of common shares	$ (461.6)		(60.2)	(401.4)
Repurchase and retirement of common shares (in shares)	(3.8)	(3.8)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 1.3					1.3
Net income from continuing operations	494.3			493.9		0.4
Other comprehensive income	(19.0)				(19.0)
Ending Balance (in shares) at Dec. 31, 2021		60.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,226.3	$ 0.6	1,143.8	157.3	(77.4)	2.0
Employee stock compensation	60.0		60.0
Deferred compensation	(1.4)		(2.5)	1.1
Employee stock compensation (in shares)		0.6
Proceeds from stock issuances under employee plans	34.1		34.1
Proceeds from stock issuances under employee plans (in shares)		0.4
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively)	(150.0)			(150.0)
Repurchase and retirement of common shares	$ (505.0)		(83.3)	(421.7)
Repurchase and retirement of common shares (in shares)	(4.4)	4.4
Net income from continuing operations	$ 447.6			447.1		0.5
Other comprehensive income	(10.1)				(10.1)
Ending Balance at Dec. 31, 2022	1,099.0
Ending Balance (in shares) at Dec. 31, 2022		57.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,101.5	$ 0.6	1,152.1	33.8	(87.5)	2.5
Employee stock compensation	57.4		57.4
Deferred compensation	2.3		1.6	0.7
Employee stock compensation (in shares)		0.6
Proceeds from stock issuances under employee plans	52.8		52.8
Proceeds from stock issuances under employee plans (in shares)		0.5
Cash dividends declared ($2.32 per share, $2.20 per share and $2.12 per share in 2017, 2016, and 2015 respectively)	(147.3)			(147.3)
Repurchase and retirement of common shares	$ (178.6)		(32.1)	(146.5)
Repurchase and retirement of common shares (in shares)	(1.6)	(1.6)
Net income from continuing operations	$ 502.7			502.8		(0.1)
Other comprehensive income	30.0				30.0
Ending Balance at Dec. 31, 2023	1,418.4
Ending Balance (in shares) at Dec. 31, 2023		56.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,420.8	$ 0.6	$ 1,231.8	$ 243.5	$ (57.5)	$ 2.4