CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Mar. 31, 2024
Statement of Cash Flows [Abstract]
Net Income	$ 178.0	$ 145.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	119.4	112.7
Deferred income taxes	0.0	(22.1)
Share-based compensation expense	11.9	11.5
Loss (gain) on the disposal of property, plant, equipment, and intangibles, net	0.0	2.2
Gain on sale of businesses, net	0.0	(11.0)
Other items	14.5	(2.5)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	119.2	107.7
Inventories, net	(42.5)	(34.1)
Other current assets	18.9	9.4
Accounts payable	9.8	(17.1)
Accruals and other, net	(9.2)	1.5
Net cash provided by operating activities	420.0	303.7
Investing activities:
Purchases of property, plant, equipment, and intangibles, net	(93.6)	(108.1)
Proceeds from the sale of property, plant, equipment, and intangibles	0.1	0.0
Proceeds from the sale of businesses	0.0	809.6
Acquisition of businesses, net of cash acquired	(15.0)	(13.7)
Net cash used in investing activities	(108.5)	687.8
Financing activities:
Payments on Private Placement Senior Notes	(125.0)	0.0
Payments on term loans	0.0	(638.1)
Payments under credit facilities, net	(30.5)	(253.2)
Acquisition related deferred or contingent consideration	(0.1)	(0.1)
Repurchases of ordinary shares	(10.6)	(64.2)
Cash dividends paid to ordinary shareholders	(56.2)	(51.4)
Contributions from noncontrolling interest holders	0.0	2.5
Stock option and other equity transactions, net	9.3	5.6
Net cash used in financing activities	(213.1)	(998.9)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	9.6	(1.3)
Increase (decrease) in cash and cash equivalents	108.0	(8.7)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 279.7	$ 198.3	$ 171.7	$ 207.0