Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2019	$ 3,071.0	$ 0.9	$ 524.8	$ 2,704.8	$ (159.5)
Beginning Balance (in shares) at Dec. 31, 2019		94,655
Common stock withheld and retired to cover taxes on vested stock awards	(10.5)		(0.8)	(9.7)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(108)
Common stock dividends declared	(320.9)			(320.9)
Share-based compensation	30.8		30.8
Share-based compensation expense (in shares)		283
Other	(0.1)		(0.4)	0.3
Comprehensive income	476.0			461.0	15.0
Ending Balance at Dec. 31, 2020	3,246.3	$ 0.9	554.4	2,835.5	(144.5)
Ending Balance (in shares) at Dec. 31, 2020		94,830
Common stock withheld and retired to cover taxes on vested stock awards	(12.9)		(0.8)	(12.1)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(95)
Common stock dividends declared	(379.9)			(379.9)
Share-based compensation	36.3		36.3
Share-based compensation expense (in shares)		247
Common stock repurchases and retirements	(193.0)		(11.5)	(181.5)
Common stock repurchases and retirements (in shares)		(1,443)
Other			1.0	(1.0)
Comprehensive income	910.4			841.1	69.3
Ending Balance at Dec. 31, 2021	3,607.2	$ 0.9	579.4	3,102.1	(75.2)
Ending Balance (in shares) at Dec. 31, 2021		93,539
Common stock withheld and retired to cover taxes on vested stock awards	(15.4)		(0.9)	(14.5)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(111)
Common stock dividends declared	(441.2)			(441.2)
Share-based compensation	37.2		37.2
Share-based compensation expense (in shares)		302
Common stock repurchases and retirements	(522.6)		(33.5)	(489.1)
Common stock repurchases and retirements (in shares)		(4,035)
Other	(0.7)		(0.4)	(0.3)
Comprehensive income	1,002.6			1,029.8	(27.2)
Ending Balance at Dec. 31, 2022	$ 3,667.1	$ 0.9	$ 581.8	$ 3,186.8	$ (102.4)
Ending Balance (in shares) at Dec. 31, 2022		89,695