Debt - Narrative (Details) - Madison Industries IAQ Solutions Corporation $ in Millions	1 Months Ended					3 Months Ended		12 Months Ended
	Jan. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Nov. 30, 2025 USD ($)	May 31, 2025 USD ($)	Jan. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024	Mar. 20, 2026 USD ($)	Apr. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Amortization of capitalized discounts and deferred financing fees						$ 4.7	$ 3.4
Interest expense						85.7	65.6
Letters of credit outstanding		$ 5.7				5.7		$ 5.7
Debt, fair value						5,667.4
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		12.9				12.9		12.9
Senior notes
Debt Instrument [Line Items]
Long-term debt, gross		1,035.0				$ 1,035.0		1,035.0
Interest rate						5.90%
Incremental Term Loan
Debt Instrument [Line Items]
Long-term debt, gross		700.0				$ 700.0		$ 700.0
Interest rate						4.10%
Mortgage payable
Debt Instrument [Line Items]
Basis spread on variable interest rate								3.83%
Long-term debt, gross		$ 0.6				$ 0.0		$ 0.6
Repayment of debt	$ 0.6
Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Deferred financing fees incurred			$ 0.1	$ 8.7	$ 0.1							$ 1.1
Decrease in the base rate					0.0025
Basis spread on variable interest rate					2.50%				2.75%
Amortization of capitalized discounts and deferred financing fees				$ 0.5	$ 0.2
Weighted average interest rate for borrowings oustanding		6.70%				6.20%		6.70%
Unused commitment fee, percentage						0.25%
Long-term debt, gross		$ 3,977.7				$ 3,971.3		$ 3,977.7
Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Decrease in the base rate				0.0075
Basis spread on variable interest rate				2.50%
Maximum borrowing capacity				$ 340.0							$ 200.0
Basis spread on variable rate, floor				0
Repayment of line of credit						0.0	0.0
Proceeds from line of credit						$ 0.0	$ 0.0
Credit Agreement | Line of Credit | Incremental Term Loan
Debt Instrument [Line Items]
Decrease in the base rate			0.0050
Basis spread on variable interest rate			2.75%	3.25%
Maximum borrowing capacity				$ 1,750.0
Basis spread on variable rate, floor			0.0050
Repayment of line of credit		$ 50.0	$ 150.0
Long-term debt, gross			$ 1,600.0
2026 Incremental Revolving Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 1,300.0