Revenue - Disaggregation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,470.6	$ 2,427.5
Revenue as a percentage of total revenue	1.000	1.000
Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ 122.9	$ 118.3
Revenue as a percentage of total revenue	0.050	0.049
Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ 296.8	$ 306.6
Revenue as a percentage of total revenue	0.120	0.126
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 129.1	$ 130.3
Revenue as a percentage of total revenue	0.052	0.053
Recycling processing and commodity sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 72.9	$ 75.8
Revenue as a percentage of total revenue	0.030	0.031
Other non-core
Disaggregation of Revenue [Line Items]
Total revenue	$ 56.2	$ 54.5
Revenue as a percentage of total revenue	0.022	0.022
Operating Segments | Collection
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,876.8	$ 1,824.5
Revenue as a percentage of total revenue	0.760	0.752
Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Total revenue	$ 557.4	$ 548.7
Revenue as a percentage of total revenue	0.226	0.226
Operating Segments | Small-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 777.9	$ 749.1
Revenue as a percentage of total revenue	0.315	0.309
Operating Segments | Large-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 530.7	$ 516.2
Revenue as a percentage of total revenue	0.215	0.213
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 10.8	$ 10.5
Revenue as a percentage of total revenue	0.004	0.004
Operating Segments | Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ 294.4	$ 288.5
Operating Segments | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	536.5	550.0
Operating Segments | Energy services
Disaggregation of Revenue [Line Items]
Total revenue	$ 45.0	$ 47.8
Revenue as a percentage of total revenue	0.018	0.020
Intersegment Eliminations | Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ (171.5)	$ (170.2)
Intersegment Eliminations | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ (239.7)	$ (243.4)