Landfill and Environmental Costs (Narrative) (Details) $ in Millions, ft³ in Billions		12 Months Ended
	Sep. 27, 2018 USD ($)	Dec. 31, 2021 USD ($) landfill ft³	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Environmental Exit Cost [Line Items]
Number of active solid waste landfills | landfill		198
Total available disposal capacity (billion in-place cubic feet) | ft³		135.0
Number of closed landfills | landfill		124
Net increase (decrease) in amortization expense		$ 6.9	$ (12.5)	$ (10.9)
Aggregate potential remediation liability, amount higher than amount recorded		342.0
Payments for management and monitoring of remediation area		57.1	63.5	49.1
Remediation liability		454.9	462.8	$ 500.2	$ 540.2
Estimated possible excess loss contingency		3.0
Bridgeton Closed Landfill
Environmental Exit Cost [Line Items]
Payments for management and monitoring of remediation area		18.9
Remediation liability		102.7
Loss contingency expected to be paid in year one		16.0
Estimated possible excess loss contingency		$ 140.0
Insurance recoveries			$ 10.8
West Lake Landfill Superfund Site
Environmental Exit Cost [Line Items]
Anticipated remediation costs	$ 229.0
West Lake Landfill Superfund Site | Minimum
Environmental Exit Cost [Line Items]
Time period alloted for remediation	4 years
West Lake Landfill Superfund Site | Maximum
Environmental Exit Cost [Line Items]
Time period alloted for remediation	5 years