Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect of changes in accounting principles	[1]	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative effect of changes in accounting principles	[1]	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Jun. 30, 2024				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)	419.5					465.3				(45.8)
Stock option exercises	50.2				50.2
Stock-based compensation	54.9				54.9
Treasury stock acquired	(1.5)								(1.5)
Treasury stock reissued	0.0				(12.5)				12.5
Common stock dividends	(309.0)					(309.0)
Ending balance (in shares) at Mar. 31, 2025				154.5
Ending balance at Mar. 31, 2025	2,382.3			$ 1.6	1,645.1	3,591.4			(2,478.2)	(377.5)
Beginning balance (in shares) at Dec. 31, 2024				154.5
Beginning balance at Dec. 31, 2024	2,228.3			$ 1.6	1,609.4	3,451.4			(2,483.0)	(351.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	216.6					243.1				(26.4)
Stock option exercises	20.9				20.9
Stock-based compensation	19.8				19.8
Treasury stock acquired	(0.3)								(0.3)
Treasury stock reissued	0.0				(5.1)				5.1
Common stock dividends	(103.2)					(103.2)
Ending balance (in shares) at Mar. 31, 2025				154.5
Ending balance at Mar. 31, 2025	$ 2,382.3			$ 1.6	1,645.1	3,591.4			(2,478.2)	(377.5)
Beginning balance (in shares) at Jun. 30, 2025	154.5			154.5
Beginning balance at Jun. 30, 2025	$ 2,655.1	$ 18.4		$ 1.6	1,663.0	3,862.5	$ 18.4		(2,599.0)	(272.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	754.4					726.2				28.1
Stock option exercises	21.2				21.2
Stock-based compensation	66.0				66.0
Treasury stock acquired	(355.8)								(355.8)
Treasury stock reissued	0.0				(5.6)				5.6
Common stock dividends	$ (340.4)					(340.4)
Ending balance (in shares) at Mar. 31, 2026	154.5			154.5
Ending balance at Mar. 31, 2026	$ 2,818.8			$ 1.6	1,744.5	4,266.7			(2,949.2)	(244.8)
Beginning balance (in shares) at Dec. 31, 2025				154.5
Beginning balance at Dec. 31, 2025	2,879.2	$ 0.0		$ 1.6	1,721.2	4,103.3			(2,747.8)	(198.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	230.5					276.3				(45.8)
Stock option exercises	3.5				3.5
Stock-based compensation	20.7				20.7
Treasury stock acquired	(202.3)								(202.3)
Treasury stock reissued	0.0				(0.9)				0.9
Common stock dividends	$ (112.8)					(112.8)
Ending balance (in shares) at Mar. 31, 2026	154.5			154.5
Ending balance at Mar. 31, 2026	$ 2,818.8			$ 1.6	$ 1,744.5	$ 4,266.7			$ (2,949.2)	$ (244.8)

[1] Reflects the adoption of accounting standard (ASU 2023-08) as described in Note 2, “New Accounting Pronouncements