Consolidated Statements of Stockholders' Deficit - USD ($) $ in Millions	Total	Common Stock Issued	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock at Cost
Beginning balance at Mar. 31, 2025	$ 973.7	$ 0.9	$ 1,219.0	$ 4,351.5	$ (80.6)	$ (4,517.1)
Beginning balance (in shares) at Mar. 31, 2025						51,700,000
Net income	273.9			273.9
Dividends	(45.8)			(45.8)
Foreign currency translation adjustments	15.9				15.9
Pension and post-retirement liability changes, net of tax	(0.2)				(0.2)
Stock-based compensation expense	8.2		8.2
Change in cash flow hedges, net of tax	3.5				3.5
Treasury shares reissued for common stock	1.5		1.1			$ 0.4
Treasury shares reissued for common stock (in shares)						0
Treasury stock purchases (in shares)						300,000
Treasury stock purchases	(212.7)					$ (212.7)
Ending balance at Jun. 30, 2025	$ 1,018.0	0.9	1,228.3	4,579.6	(61.4)	$ (4,729.4)
Ending balance (in shares) at Jun. 30, 2025						52,000,000.0
Beginning balance at Dec. 31, 2025					(48.5)
Beginning balance (in shares) at Dec. 31, 2025	52,374,147
Net income	$ 386.2
Ending balance at Jun. 30, 2026	$ 1,297.2	0.9	1,255.3	5,185.1	(58.6)	$ (5,085.5)
Ending balance (in shares) at Jun. 30, 2026	52,611,203					52,600,000
Beginning balance at Mar. 31, 2026	$ 1,213.9	0.9	1,249.7	4,963.0	(48.0)	$ (4,951.7)
Beginning balance (in shares) at Mar. 31, 2026						52,400,000
Net income	269.0			269.0
Dividends	(46.9)			(46.9)
Foreign currency translation adjustments	(1.8)				(1.8)
Stock-based compensation expense	5.4		5.4
Purchase of common stock under Employee Stock Purchase Program	0.4		0.4
Change in cash flow hedges, net of tax	(8.8)				(8.8)
Treasury shares reissued for common stock	0.0		(0.2)			$ 0.2
Treasury shares reissued for common stock (in shares)						0
Treasury stock purchases (in shares)						200,000
Treasury stock purchases	(134.0)					$ (134.0)
Ending balance at Jun. 30, 2026	$ 1,297.2	$ 0.9	$ 1,255.3	$ 5,185.1	$ (58.6)	$ (5,085.5)
Ending balance (in shares) at Jun. 30, 2026	52,611,203					52,600,000