Acquisitions - Narrative (Details) $ in Millions		9 Months Ended
	Sep. 30, 2025 branch_location	Nov. 02, 2025 USD ($)	Oct. 27, 2024 USD ($)	Sep. 16, 2024 branch_location	Sep. 09, 2024 branch_location	Aug. 12, 2024 branch_location	May 06, 2024 branch_location	Apr. 30, 2024 branch_location	Apr. 01, 2024 branch_location	Mar. 07, 2024 branch_location	Feb. 12, 2024 branch_location
Business Combination [Line Items]
Transaction value | $		$ 49	$ 748
Initial cash consideration | $		31
Contingent consideration | $		14	5
Goodwill, expected tax deductible amount | $		20	$ 239
Canada Waterworks
Business Combination [Line Items]
Number of branch locations acquired	3
Contingent consideration | $		14
Canada Waterworks | Minimum
Business Combination [Line Items]
Contingent consideration liability | $		0
Canada Waterworks | Maximum
Business Combination [Line Items]
Contingent consideration liability | $		$ 18
Contingent consideration EBITDA target period	2 years
Green Equipment
Business Combination [Line Items]
Number of branch locations acquired				1
GoGreen
Business Combination [Line Items]
Number of branch locations acquired					4
HM Pipe Products
Business Combination [Line Items]
Number of branch locations acquired						2
GSC
Business Combination [Line Items]
Number of branch locations acquired							1
EGW
Business Combination [Line Items]
Number of branch locations acquired								1
ACF West
Business Combination [Line Items]
Number of branch locations acquired									6
Dana Kepner
Business Combination [Line Items]
Number of branch locations acquired										21
Eastern Supply
Business Combination [Line Items]
Number of branch locations acquired											2