Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions					3 Months Ended	11 Months Ended
	Mar. 31, 2025	Feb. 03, 2025	Dec. 18, 2024	May 01, 2024	Mar. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Preliminary Allocation
Goodwill	$ 1,490.1				$ 1,490.1	$ 1,490.1	$ 1,478.0
Therma Foam
Acquisitions
Total cash consideration transferred		$ 52.9
Preliminary Allocation
Receivables, net		2.7
Inventories		1.4
Other current assets		0.1
Property, plant and equipment		8.8
Other intangible assets		6.7
Accounts payable		(0.9)
Other current liabilities		(0.6)
Total identifiable net assets		18.2
Goodwill		$ 34.7
PFB Holdco, Inc
Acquisitions
Total cash consideration transferred	265.9		$ 268.9
Preliminary Allocation
Cash and cash equivalents	6.4		6.4		6.4	6.4
Receivables, net	9.6		9.6		9.6	9.6
Inventories	14.5		14.5		14.5	14.5
Other current assets	6.6		6.6		6.6	6.6
Property, plant and equipment	31.7		31.7		31.7	31.7
Other intangible assets	124.3		112.8		124.3	124.3
Other long-term assets	46.1		46.1		46.1	46.1
Accounts payable	(4.6)		(4.6)		(4.6)	(4.6)
Other current liabilities	(14.8)		(27.8)		(14.8)	(14.8)
Deferred taxes	(29.7)		(27.9)		(29.7)	(29.7)
Other long-term liabilities	(43.5)		(43.5)		(43.5)	(43.5)
Total identifiable net assets	146.6		123.9		146.6	146.6
Goodwill	119.3		$ 145.0		119.3	119.3
PFB Holdco, Inc | Measurement Period Adjustments
Acquisitions
Total cash consideration transferred					(3.0)
Measurement Period Adjustments
Cash and cash equivalents					0.0
Receivables, net					0.0
Inventories					0.0
Other current assets					0.0
Property, plant and equipment					0.0
Other intangible assets					11.5
Other long-term assets					0.0
Accounts payable					0.0
Other current liabilities					13.0
Deferred taxes					(1.8)
Other long-term liabilities					0.0
Total identifiable net assets					22.7
Goodwill					(25.7)
MTL Holdings LLC
Acquisitions
Total cash consideration transferred	424.6			$ 423.1
Preliminary Allocation
Cash and cash equivalents	10.3			10.3	10.3	10.3
Receivables, net	14.0			14.0	14.0	14.0
Inventories	17.2			17.2	17.2	17.2
Other current assets	0.9			0.9	0.9	0.9
Property, plant and equipment	10.4			10.7	10.4	10.4
Other intangible assets	248.3			248.3	248.3	248.3
Other long-term assets	8.4			8.1	8.4	8.4
Accounts payable	(5.9)			(5.9)	(5.9)	(5.9)
Other current liabilities	(6.1)			(6.1)	(6.1)	(6.1)
Deferred taxes	(6.9)			(6.9)	(6.9)	(6.9)
Other long-term liabilities	(7.6)			(6.7)	(7.6)	(7.6)
Total identifiable net assets	283.0			283.9	283.0	283.0
Goodwill	$ 141.6			$ 139.2	$ 141.6	141.6
MTL Holdings LLC | Measurement Period Adjustments
Acquisitions
Total cash consideration transferred						1.5
Measurement Period Adjustments
Cash and cash equivalents						0.0
Receivables, net						0.0
Inventories						0.0
Other current assets						0.0
Property, plant and equipment						(0.3)
Other intangible assets						0.0
Other long-term assets						0.3
Accounts payable						0.0
Other current liabilities						0.0
Deferred taxes						0.0
Other long-term liabilities						(0.9)
Total identifiable net assets						(0.9)
Goodwill						$ 2.4