Goodwill and Other Intangible Assets - Goodwill and Accumulated Goodwill Impairment Losses (Details) - USD ($)		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		$ 2,510,200,000	$ 2,289,900,000
Accumulated goodwill impairment losses, beginning balance		(1,281,800,000)	(1,281,800,000)
Goodwill, net, beginning balance		1,228,400,000	1,008,100,000
Goodwill acquired during year		111,600,000	220,300,000
Impairment losses during year	$ (88,000,000.0)	(88,000,000.0)	0
Other		18,700,000
Goodwill, gross, ending balance		2,640,500,000	2,510,200,000
Accumulated goodwill impairment losses, ending balance		(1,369,800,000)	(1,281,800,000)
Goodwill, net, ending balance		1,270,700,000	1,228,400,000
Northeast segment
Goodwill [Roll Forward]
Impairment losses during year		(10,300,000)
South segment
Goodwill [Roll Forward]
Impairment losses during year		(17,400,000)
Midwest segment
Goodwill [Roll Forward]
Impairment losses during year		(60,300,000)
Operating segments | Northeast segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		848,400,000	792,000,000.0
Accumulated goodwill impairment losses, beginning balance		(707,600,000)	(707,600,000)
Goodwill, net, beginning balance		140,800,000	84,400,000
Goodwill acquired during year		67,400,000	56,400,000
Impairment losses during year		(10,300,000)
Other		(1,500,000)
Goodwill, gross, ending balance		914,300,000	848,400,000
Accumulated goodwill impairment losses, ending balance		(717,900,000)	(707,600,000)
Goodwill, net, ending balance		196,400,000	140,800,000
Operating segments | South segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		185,200,000	136,900,000
Accumulated goodwill impairment losses, beginning balance		(34,600,000)	(34,600,000)
Goodwill, net, beginning balance		150,600,000	102,300,000
Goodwill acquired during year		44,200,000	48,300,000
Impairment losses during year		(17,400,000)
Other		7,200,000
Goodwill, gross, ending balance		236,600,000	185,200,000
Accumulated goodwill impairment losses, ending balance		(52,000,000.0)	(34,600,000)
Goodwill, net, ending balance		184,600,000	150,600,000
Operating segments | West segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		210,400,000	159,000,000.0
Accumulated goodwill impairment losses, beginning balance		(16,600,000)	(16,600,000)
Goodwill, net, beginning balance		193,800,000	142,400,000
Goodwill acquired during year		0	51,400,000
Impairment losses during year		0
Other		6,400,000
Goodwill, gross, ending balance		216,800,000	210,400,000
Accumulated goodwill impairment losses, ending balance		(16,600,000)	(16,600,000)
Goodwill, net, ending balance		200,200,000	193,800,000
Operating segments | Midwest segment
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		1,110,100,000	1,046,700,000
Accumulated goodwill impairment losses, beginning balance		(435,300,000)	(435,300,000)
Goodwill, net, beginning balance		674,800,000	611,400,000
Goodwill acquired during year		0	63,400,000
Impairment losses during year		(60,300,000)
Other		6,600,000
Goodwill, gross, ending balance		1,116,700,000	1,110,100,000
Accumulated goodwill impairment losses, ending balance		(495,600,000)	(435,300,000)
Goodwill, net, ending balance		621,100,000	674,800,000
Other
Goodwill [Roll Forward]
Goodwill, gross, beginning balance		156,100,000	155,300,000
Accumulated goodwill impairment losses, beginning balance		(87,700,000)	(87,700,000)
Goodwill, net, beginning balance		68,400,000	67,600,000
Goodwill acquired during year		0	800,000
Impairment losses during year		0
Other		0
Goodwill, gross, ending balance		156,100,000	156,100,000
Accumulated goodwill impairment losses, ending balance		(87,700,000)	(87,700,000)
Goodwill, net, ending balance		$ 68,400,000	$ 68,400,000