Revenue Recognition - Schedule of Revenues Disaggregated by End Market and Product (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net revenue	$ 778.2	$ 760.6	$ 2,223.3	$ 2,191.1
Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	100.00%	100.00%	100.00%	100.00%
Net revenue, Installation
Disaggregation of Revenue [Line Items]
Net revenue	$ 721.1	$ 713.7	$ 2,083.9	$ 2,066.9
Net revenue, Installation \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	93.00%	94.00%	94.00%	94.00%
Insulation
Disaggregation of Revenue [Line Items]
Net revenue	$ 440.3	$ 450.2	$ 1,301.3	$ 1,325.9
Insulation \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	57.00%	59.00%	59.00%	60.00%
Shower doors, shelving and mirrors
Disaggregation of Revenue [Line Items]
Net revenue	$ 57.3	$ 55.0	$ 165.3	$ 157.3
Shower doors, shelving and mirrors \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	7.00%	7.00%	7.00%	7.00%
Garage doors
Disaggregation of Revenue [Line Items]
Net revenue	$ 44.5	$ 45.3	$ 131.1	$ 131.2
Garage doors \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	6.00%	6.00%	6.00%	6.00%
Waterproofing
Disaggregation of Revenue [Line Items]
Net revenue	$ 43.6	$ 39.2	$ 118.5	$ 104.4
Waterproofing \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	6.00%	5.00%	5.00%	5.00%
Rain gutters
Disaggregation of Revenue [Line Items]
Net revenue	$ 35.2	$ 34.6	$ 93.6	$ 94.1
Rain gutters \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	4.00%	5.00%	4.00%	4.00%
Fireproofing/firestopping
Disaggregation of Revenue [Line Items]
Net revenue	$ 31.3	$ 21.3	$ 79.0	$ 64.4
Fireproofing/firestopping \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	4.00%	3.00%	4.00%	3.00%
Window blinds
Disaggregation of Revenue [Line Items]
Net revenue	$ 20.5	$ 19.5	$ 58.6	$ 56.7
Window blinds \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	3.00%	3.00%	3.00%	3.00%
Other building products
Disaggregation of Revenue [Line Items]
Net revenue	$ 48.4	$ 48.6	$ 136.5	$ 132.9
Other building products \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	6.00%	6.00%	6.00%	6.00%
Other
Disaggregation of Revenue [Line Items]
Net revenue	$ 57.1	$ 46.9	$ 139.4	$ 124.2
Other \| Revenue from Contract with Customer, Product and Service Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	7.00%	6.00%	6.00%	6.00%
Net revenue, Installation
Disaggregation of Revenue [Line Items]
Net revenue	$ 721.1	$ 713.7	$ 2,083.9	$ 2,066.9
Net revenue, Installation \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	93.00%	94.00%	94.00%	94.00%
Residential new construction
Disaggregation of Revenue [Line Items]
Net revenue	$ 540.3	$ 548.8	$ 1,583.5	$ 1,594.0
Residential new construction \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	70.00%	72.00%	71.00%	73.00%
Repair and remodel
Disaggregation of Revenue [Line Items]
Net revenue	$ 46.1	$ 44.9	$ 131.7	$ 127.5
Repair and remodel \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	6.00%	6.00%	6.00%	6.00%
Commercial
Disaggregation of Revenue [Line Items]
Net revenue	$ 134.7	$ 120.0	$ 368.7	$ 345.4
Commercial \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	17.00%	16.00%	17.00%	15.00%
Other
Disaggregation of Revenue [Line Items]
Net revenue	$ 57.1	$ 46.9	$ 139.4	$ 124.2
Other \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (percent)	7.00%	6.00%	6.00%	6.00%

Installed Building Products, Inc. 10-Q