Goodwill and Other Intangible Assets - Goodwill and Accumulated Goodwill Impairment Losses (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 2,640,500,000
Accumulated goodwill impairment losses, beginning balance	(1,369,800,000)
Goodwill, net, beginning balance	1,270,700,000
Goodwill, impairment loss during period	(113,000,000.0)	$ 0
Goodwill, gross, ending balance	2,640,500,000
Accumulated goodwill impairment losses, ending balance	(1,482,800,000)
Goodwill, net, ending balance	1,157,700,000
Operating segments | Northeast segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	914,300,000
Accumulated goodwill impairment losses, beginning balance	(717,900,000)
Goodwill, net, beginning balance	196,400,000
Goodwill, impairment loss during period	(43,500,000)
Goodwill, gross, ending balance	914,300,000
Accumulated goodwill impairment losses, ending balance	(761,400,000)
Goodwill, net, ending balance	152,900,000
Operating segments | South segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	236,600,000
Accumulated goodwill impairment losses, beginning balance	(52,000,000.0)
Goodwill, net, beginning balance	184,600,000
Goodwill, impairment loss during period	(9,000,000.0)
Goodwill, gross, ending balance	236,600,000
Accumulated goodwill impairment losses, ending balance	(61,000,000.0)
Goodwill, net, ending balance	175,600,000
Operating segments | West segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	216,800,000
Accumulated goodwill impairment losses, beginning balance	(16,600,000)
Goodwill, net, beginning balance	200,200,000
Goodwill, impairment loss during period	0
Goodwill, gross, ending balance	216,800,000
Accumulated goodwill impairment losses, ending balance	(16,600,000)
Goodwill, net, ending balance	200,200,000
Operating segments | Midwest segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	1,116,700,000
Accumulated goodwill impairment losses, beginning balance	(495,600,000)
Goodwill, net, beginning balance	621,100,000
Goodwill, impairment loss during period	(60,500,000)
Goodwill, gross, ending balance	1,116,700,000
Accumulated goodwill impairment losses, ending balance	(556,100,000)
Goodwill, net, ending balance	560,600,000
Other
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	156,100,000
Accumulated goodwill impairment losses, beginning balance	(87,700,000)
Goodwill, net, beginning balance	68,400,000
Goodwill, impairment loss during period	0
Goodwill, gross, ending balance	156,100,000
Accumulated goodwill impairment losses, ending balance	(87,700,000)
Goodwill, net, ending balance	$ 68,400,000