Acquisitions, Goodwill, and Other Intangible Assets, Net - Fair Values of Identifiable Intangible Assets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
ScheduleOfIntangibleAssets [Line Items]
Weighted Average Amortization Period (in years)	8 years 10 months 24 days
McKee
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 141.5
Superior Acquisition
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	1,034.0
All Others
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 44.3
Customer relationships
ScheduleOfIntangibleAssets [Line Items]
Weighted Average Amortization Period (in years)	9 years 9 months 18 days
Customer relationships \| McKee
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 108.3
Customer relationships \| Superior Acquisition
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	856.0
Customer relationships \| All Others
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 40.7
Backlog
ScheduleOfIntangibleAssets [Line Items]
Weighted Average Amortization Period (in years)	1 year 6 months
Backlog \| McKee
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 30.4
Backlog \| Superior Acquisition
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	95.0
Backlog \| All Others
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 0.5
Trade names
ScheduleOfIntangibleAssets [Line Items]
Weighted Average Amortization Period (in years)	9 years 2 months 12 days
Trade names \| McKee
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 2.8
Trade names \| Superior Acquisition
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	83.0
Trade names \| All Others
ScheduleOfIntangibleAssets [Line Items]
Total identifiable intangible assets	$ 3.1