Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Jun. 30, 2023		154.5
Beginning balance at Jun. 30, 2023	$ 2,240.6	$ 1.6	$ 1,436.8	$ 3,113.0	$ (2,026.1)	$ (284.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	95.9			161.2		(65.3)
Stock option exercises	45.8		45.8
Stock-based compensation	35.7		35.7
Treasury stock acquired	(162.1)				(162.1)
Treasury stock reissued	0.0		(11.5)		11.5
Common stock dividends	(188.3)			(188.3)
Ending balance (in shares) at Dec. 31, 2023		154.5
Ending balance at Dec. 31, 2023	2,067.6	$ 1.6	1,506.8	3,085.9	(2,176.6)	(350.0)
Beginning balance (in shares) at Sep. 30, 2023		154.5
Beginning balance at Sep. 30, 2023	2,112.7	$ 1.6	1,481.0	3,109.8	(2,178.6)	(301.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	21.3			70.3		(49.0)
Stock option exercises	8.2		8.2
Stock-based compensation	19.8		19.8
Treasury stock acquired	(0.2)				(0.2)
Treasury stock reissued	0.0		(2.2)		2.2
Common stock dividends	(94.2)			(94.2)
Ending balance (in shares) at Dec. 31, 2023		154.5
Ending balance at Dec. 31, 2023	$ 2,067.6	$ 1.6	1,506.8	3,085.9	(2,176.6)	(350.0)
Beginning balance (in shares) at Jun. 30, 2024	154.5	154.5
Beginning balance at Jun. 30, 2024	$ 2,168.2	$ 1.6	1,552.5	3,435.1	(2,489.2)	(331.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	202.8			222.2		(19.4)
Stock option exercises	29.3		29.3
Stock-based compensation	35.1		35.1
Treasury stock acquired	(1.2)				(1.2)
Treasury stock reissued	0.0		(7.4)		7.4
Common stock dividends	$ (205.8)			(205.8)
Ending balance (in shares) at Dec. 31, 2024	154.5	154.5
Ending balance at Dec. 31, 2024	$ 2,228.3	$ 1.6	1,609.4	3,451.4	(2,483.0)	(351.1)
Beginning balance (in shares) at Sep. 30, 2024		154.5
Beginning balance at Sep. 30, 2024	2,206.4	$ 1.6	1,580.3	3,412.0	(2,484.9)	(302.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	93.9			142.4		(48.6)
Stock option exercises	11.3		11.3
Stock-based compensation	20.9		20.9
Treasury stock acquired	(1.2)				(1.2)
Treasury stock reissued	0.0		(3.2)		3.2
Common stock dividends	$ (103.0)			(103.0)
Ending balance (in shares) at Dec. 31, 2024	154.5	154.5
Ending balance at Dec. 31, 2024	$ 2,228.3	$ 1.6	$ 1,609.4	$ 3,451.4	$ (2,483.0)	$ (351.1)