Goodwill and Other Intangible Assets, Net - Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Goodwill [Roll forward]
Beginning balance	$ 10,830.9
Acquisitions	293.9
Adjustments to Acquisitions	3.5
Ending balance	11,128.3
East [Member]
Goodwill [Roll forward]
Beginning balance	3,046.0
Acquisitions	8.1
Adjustments to Acquisitions	(0.4)
Ending balance	3,053.7
Central [Member]
Goodwill [Roll forward]
Beginning balance	3,279.0
Acquisitions	14.7
Adjustments to Acquisitions	(0.4)
Ending balance	3,293.3
West [Member]
Goodwill [Roll forward]
Beginning balance	4,505.9
Acquisitions	271.1
Adjustments to Acquisitions	4.3
Ending balance	$ 4,781.3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 350

-SubTopic 20

-Section 50

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 350

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