Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Balance at beginning of period	$ 3,494.4	$ 2,414.0
Acquisitions	3.7	1,080.4
Goodwill reclassified from assets held for sale	8.1
Divestitures	(159.7)
Goodwill Increased	303.0
Balance at end of period	3,649.5	3,494.4
East Group
Goodwill [Line Items]
Balance at beginning of period	759.4	572.5
Acquisitions		186.9
Goodwill Increased	5.0
Balance at end of period	764.4	759.4
West Group
Goodwill [Line Items]
Balance at beginning of period	2,735.0	1,841.5
Acquisitions	3.7	893.5
Goodwill reclassified from assets held for sale	8.1
Divestitures	(159.7)
Goodwill Increased	298.0
Balance at end of period	$ 2,885.1	$ 2,735.0