Financial Instruments - Narrative (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Contingent consideration	$ 68,200,000	$ 73,900,000
Waste Management Contract, Sonoma County
Derivative [Line Items]
Contingent consideration	66,300,000
Potential undiscounted future contingent liability payments, minimum	79,000,000
Potential undiscounted future contingent liability payments, maximum	168,000,000
Change in contingent consideration, liability	$ 0
Waste Management Contract, Sonoma County \| Landfill
Derivative [Line Items]
Expected useful life	30 years
Landfill Acquisitions
Derivative [Line Items]
Contingent consideration	$ 4,200,000
Change in contingent consideration, liability	0
Collection Business
Derivative [Line Items]
Contingent consideration	1,600,000
Carrying Amount
Derivative [Line Items]
Long-term debt	8,400,000,000	8,300,000,000
Contingent consideration	72,100,000	71,400,000
Estimate of Fair Value Measurement
Derivative [Line Items]
Long-term debt	$ 9,100,000,000	$ 8,700,000,000

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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-Publisher FASB
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For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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-SubTopic 30
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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