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, 2022	$ 3,667.1	$ 0.9	$ 581.8	$ 3,186.8	$ (102.4)
Beginning Balance (in shares) at Dec. 31, 2022		89,695
Common stock withheld and retired to cover taxes on vested stock awards	(15.6)		(1.1)	(14.5)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(119)
Common stock dividends declared	(226.1)			(226.1)
Share-based compensation and other	26.7		26.7
Share-based compensation and other (in shares)		340
Comprehensive income	396.5			392.8	3.7
Ending Balance at Jun. 30, 2023	3,848.6	$ 0.9	607.4	3,339.0	(98.7)
Ending Balance (in shares) at Jun. 30, 2023		89,916
Beginning Balance at Mar. 31, 2023	3,757.7	$ 0.9	597.8	3,259.3	(100.3)
Beginning Balance (in shares) at Mar. 31, 2023		89,932
Common stock withheld and retired to cover taxes on vested stock awards	(10.8)		(0.7)	(10.1)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(83)
Common stock dividends declared	(112.9)			(112.9)
Share-based compensation and other	10.3		10.3
Share-based compensation and other (in shares)		67
Comprehensive income	204.3			202.7	1.6
Ending Balance at Jun. 30, 2023	3,848.6	$ 0.9	607.4	3,339.0	(98.7)
Ending Balance (in shares) at Jun. 30, 2023		89,916
Beginning Balance at Dec. 31, 2023	3,997.3	$ 0.9	620.1	3,447.2	(70.9)
Beginning Balance (in shares) at Dec. 31, 2023		89,625
Common stock withheld and retired to cover taxes on vested stock awards	(24.1)		(1.3)	(22.8)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(135)
Common stock dividends declared	(225.9)			(225.9)
Share-based compensation and other	31.5		31.5
Share-based compensation and other (in shares)		325
Comprehensive income	347.8			345.9	1.9
Ending Balance at Jun. 30, 2024	4,126.6	$ 0.9	650.3	3,544.4	(69.0)
Ending Balance (in shares) at Jun. 30, 2024		89,815
Beginning Balance at Mar. 31, 2024	4,031.0	$ 0.9	640.5	3,459.6	(70.0)
Beginning Balance (in shares) at Mar. 31, 2024		89,804
Common stock withheld and retired to cover taxes on vested stock awards	(1.5)		(0.1)	(1.4)
Common stock withheld and retired to cover taxes on vested stock awards (in shares)		(8)
Common stock dividends declared	(112.7)			(112.7)
Share-based compensation and other	9.9		9.9
Share-based compensation and other (in shares)		19
Comprehensive income	199.9			198.9	1.0
Ending Balance at Jun. 30, 2024	$ 4,126.6	$ 0.9	$ 650.3	$ 3,544.4	$ (69.0)
Ending Balance (in shares) at Jun. 30, 2024		89,815