Landfill and Environmental Costs - Narrative (Details) $ in Millions, ft³ in Billions		6 Months Ended
	Sep. 27, 2018 USD ($)	Jun. 30, 2019 USD ($) landfill ft³	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Environmental Remediation Obligations [Abstract]
Number of active solid waste landfills | landfill		190
Total available disposal capacity (in cubic feet) | ft³		137.7
Number of closed landfills | landfill		129
Environmental Exit Cost [Line Items]
Amount of aggregate potential remediation liability		$ 369.0
Payments for management and monitoring of remediation area		17.8	$ 21.2
Remediation liability		521.7	$ 555.4	$ 540.2	$ 564.0
Bridgeton Landfill
Environmental Exit Cost [Line Items]
Payments for management and monitoring of remediation area		6.9
Remediation liability		154.2
Remediation liability expected to be paid during the remainder of 2018		8.0
Bridgeton Landfill | Maximum
Environmental Exit Cost [Line Items]
Range of loss for remediation costs		$ 171.0
West Lake Landfill Superfund Site
Environmental Exit Cost [Line Items]
Environmental exit costs, anticipated cost	$ 229.0
West Lake Landfill Superfund Site | Minimum
Environmental Exit Cost [Line Items]
Environmental exit costs, time period allotted for completion	4 years
West Lake Landfill Superfund Site | Maximum
Environmental Exit Cost [Line Items]
Environmental exit costs, time period allotted for completion	5 years