Business Combinations and Discontinued Operations - Summary of Intangible Assets Acquired (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Combinations [Line Items]
Total subject to amortization	$ 581.0
Weighted-average amortization period	31 years
Intangible assets acquired held for sale	$ 264.9
Indefinite life intangible assets	36.0	$ 36.0
Customer Relationships
Business Combinations [Line Items]
Total subject to amortization	$ 334.0
Weighted-average amortization period	25 years
Operating Permits
Business Combinations [Line Items]
Total subject to amortization	$ 236.5
Weighted-average amortization period	40 years
Lehigh West Region
Business Combinations [Line Items]
Total subject to amortization	$ 286.1
Weighted-average amortization period	35 years
Intangible assets acquired held for sale	$ 264.9
Indefinite life intangible assets	551.0
Lehigh West Region | Customer Relationships
Business Combinations [Line Items]
Total subject to amortization	$ 112.6
Weighted-average amortization period	27 years
Intangible assets acquired held for sale	$ 27.9
Lehigh West Region | Operating Permits
Business Combinations [Line Items]
Total subject to amortization	$ 173.5
Weighted-average amortization period	40 years
Intangible assets acquired held for sale	$ 237.0