Goodwill - Changes in Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Goodwill [Line Items]
Balance at January 1, 2022		$ 3,494.4
Acquisitions		3.7
Goodwill Increased	$ 171.4	293.8
Divestitures		(159.7)
Goodwill reclassified from assets held for sale		8.2
Balance at September 30, 2022	3,640.4	3,640.4
East Group
Goodwill [Line Items]
Balance at January 1, 2022		759.4
Acquisitions		0.0
Goodwill Increased		5.0
Divestitures		0.0
Goodwill reclassified from assets held for sale		0.0
Balance at September 30, 2022	764.4	764.4
West Group
Goodwill [Line Items]
Balance at January 1, 2022		2,735.0
Acquisitions		3.7
Goodwill Increased		288.8
Divestitures		(159.7)
Goodwill reclassified from assets held for sale		8.2
Balance at September 30, 2022	$ 2,876.0	$ 2,876.0