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Acquisitions (Details) - USD ($) $ in Millions					3 Months Ended
	Apr. 01, 2022	Dec. 31, 2021	Dec. 01, 2021	Aug. 01, 2021	Mar. 31, 2021
Consideration transferred:
Notes issued to former owners			$ 8.0
Atlantic
Consideration transferred:
Fair value of consideration transferred	$ 48.1
Cash paid at closing	34.1
Notes issued to former owners	$ 5.3
MEP Holdings
Consideration transferred:
Fair value of consideration transferred		$ 57.3
Cash paid at closing		45.2
Notes issued to former owners		7.6
Mechanical Contractor Kentucky
Consideration transferred:
Fair value of consideration transferred		20.5
Mechanical Contractor Indiana
Consideration transferred:
Fair value of consideration transferred		$ 4.7
Ivey
Consideration transferred:
Fair value of consideration transferred			79.1
Cash paid at closing			64.1
Other amount payable			$ 0.4
Amteck
Consideration transferred:
Fair value of consideration transferred				$ 138.9
Cash paid at closing				107.4
Notes issued to former owners				10.0
Working capital adjustment				8.6
Identifiable intangible assets				113.1
Amteck | Contingent earn-out obligations
Consideration transferred:
Estimated fair value of contingent earn-out payments				$ 12.9
Mechanical Contractor Utah
Consideration transferred:
Fair value of consideration transferred					$ 18.1

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