Business Combinations and Discontinued Operations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Oct. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets:
Goodwill		$ 3,494.4		$ 2,414.0	$ 2,396.8
Lehigh West Region
Assets:
Inventories			$ 95.5
Property, plant and equipment	[1]		859.5
Intangible assets, other than goodwill			551.0
Goodwill			989.2
Other assets			54.6
Total Assets			2,549.8
Liabilities:
Asset retirement obligations			168.9
Operating and finance lease liabilities			57.5
Other liabilities			39.9
Total Liabilities			266.3
Total Consideration			$ 2,283.5

[1] Includes mineral reserves of $332.0 million.