Acquisitions - Schedule of Intangible Assets and Goodwill (Details) $ in Millions	Dec. 31, 2024 USD ($)	Nov. 01, 2024 USD ($) branch	Oct. 01, 2024 USD ($) branch	Sep. 10, 2024 USD ($) branch	Aug. 01, 2024 USD ($) branch	Jul. 10, 2024 USD ($) branch	Jul. 01, 2024 USD ($) branch	May 01, 2024 USD ($) branch	Apr. 15, 2024 USD ($) branch	Feb. 12, 2024 USD ($) branch	Feb. 01, 2024 USD ($) branch	Dec. 31, 2023 USD ($)	Nov. 01, 2023 USD ($) branch	Oct. 02, 2023 USD ($) branch	Sep. 05, 2023 USD ($) branch	Aug. 01, 2023 USD ($) branch	Jul. 11, 2023 USD ($) branch	Jun. 12, 2023 USD ($) branch	Mar. 31, 2023 USD ($) branch	Jan. 04, 2023 USD ($) branch	Dec. 31, 2022 USD ($)
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill recognized	$ 2,094.7											$ 1,952.6									$ 1,916.3
Fairway Wholesale Distribution, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch		1
Goodwill recognized		$ 4.2
Intangible Assets Acquired		$ 5.0
Ryan Seamless Gutter Systems, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch			1
Goodwill recognized			$ 4.8
Intangible Assets Acquired			$ 4.7
Chicago Metal Supply & Fabrication, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch				1
Goodwill recognized				$ 5.0
Intangible Assets Acquired				$ 5.8
Passaic Metal and Building Supplies Co. and affiliates
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch					9
Goodwill recognized					$ 44.5
Intangible Assets Acquired					$ 43.0
SSR Roof Supply Ltd.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch					2
Goodwill recognized					$ 6.0
Intangible Assets Acquired					$ 10.6
Roofers Mart of Southern California, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch						1
Goodwill recognized						$ 0.6
Intangible Assets Acquired						$ 1.1
Integrity Metals, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch							2
Goodwill recognized							$ 5.5
Intangible Assets Acquired							$ 6.0
Extreme Metal Fabricators, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch							2
Goodwill recognized							$ 9.7
Intangible Assets Acquired							$ 15.2
Smalley & Company
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch								11
Goodwill recognized								$ 0.3
Intangible Assets Acquired								$ 25.8
General Roofing & Siding Supply Co.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch									5
Goodwill recognized									$ 3.7
Intangible Assets Acquired									$ 8.8
Metro Sealant & Waterproofing Supply, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch										4
Goodwill recognized										$ 22.4
Intangible Assets Acquired										$ 25.2
Roofers Supply of Greenville
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch											3
Goodwill recognized											$ 35.1
Intangible Assets Acquired											$ 26.6
H&H Roofing Supply, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch													1
Goodwill recognized													$ 1.1
Intangible Assets Acquired													$ 1.0
Garvin Construction Products
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch														5
Goodwill recognized														$ 17.0
Intangible Assets Acquired														$ 10.1
S&H Building Material Corporation
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch															1
Goodwill recognized															$ 5.3
Intangible Assets Acquired															$ 4.1
All American Vinyl Siding Supply, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																1
Goodwill recognized																$ 0.7
Intangible Assets Acquired																$ 0.8
Crossroads Roofing Supply, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																	5
Goodwill recognized																	$ 5.8
Intangible Assets Acquired																	$ 11.1
Silver State Building Materials, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																		1
Goodwill recognized																		$ 0.6
Intangible Assets Acquired																		$ 0.9
Al's Roofing Supply, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																			4
Goodwill recognized																			$ 3.7
Intangible Assets Acquired																			$ 7.1
Prince Building Systems, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																			1
Goodwill recognized																			$ 0.3
Intangible Assets Acquired																			$ 2.0
First Coastal Exteriors, LLC
Business Combination, Separately Recognized Transactions [Line Items]
Branches | branch																				2
Goodwill recognized																				$ 0.8
Intangible Assets Acquired																				$ 1.9