Business Combinations and Discontinued Operations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Oct. 01, 2021
Assets:
Goodwill	$ 3,392.0	$ 3,494.4
Lehigh West Region
Assets:
Inventories			$ 94.1
Property, plant and equipment			850.2
Intangible assets, other than goodwill			551.0
Goodwill			992.8
Other assets			54.6
Total assets			2,542.7
Liabilities:
Asset retirement obligations			178.9
Operating and finance lease liabilities			57.5
Other liabilities			41.7
Total liabilities			278.1
Total consideration			$ 2,264.6