Revenue - Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,646.9	$ 2,565.7	$ 7,722.7	$ 7,510.9
Revenue as a percentage of total revenue	100.00%	100.00%	100.00%	100.00%
Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ 154.9	$ 142.3	$ 429.0	$ 397.9
Revenue as a percentage of total revenue	5.80%	5.50%	5.60%	5.30%
Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ 339.8	$ 331.4	$ 974.1	$ 953.2
Revenue as a percentage of total revenue	12.80%	12.90%	12.60%	12.70%
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 125.6	$ 132.5	$ 382.8	$ 385.7
Revenue as a percentage of total revenue	4.80%	5.20%	5.00%	5.10%
Recycling processing and commodity sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 68.6	$ 76.0	$ 213.2	$ 219.9
Revenue as a percentage of total revenue	2.60%	3.00%	2.80%	2.90%
Other non-core
Disaggregation of Revenue [Line Items]
Total revenue	$ 57.0	$ 56.5	$ 169.6	$ 165.8
Revenue as a percentage of total revenue	2.20%	2.20%	2.20%	2.20%
Operating Segments | Collection
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,968.8	$ 1,908.0	$ 5,793.2	$ 5,624.5
Revenue as a percentage of total revenue	74.40%	74.40%	75.00%	74.90%
Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Total revenue	$ 574.4	$ 563.2	$ 1,701.8	$ 1,672.4
Revenue as a percentage of total revenue	21.70%	22.00%	22.00%	22.30%
Operating Segments | Small-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 799.1	$ 772.5	$ 2,369.0	$ 2,286.0
Revenue as a percentage of total revenue	30.20%	30.10%	30.70%	30.40%
Operating Segments | Large-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 583.6	$ 561.3	$ 1,688.2	$ 1,633.5
Revenue as a percentage of total revenue	22.10%	21.90%	21.90%	21.80%
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 11.7	$ 11.0	$ 34.2	$ 32.6
Revenue as a percentage of total revenue	0.40%	0.40%	0.40%	0.40%
Operating Segments | Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ 347.1	$ 322.9	$ 985.8	$ 932.5
Operating Segments | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	605.3	590.2	1,750.7	1,720.7
Operating Segments | Environmental services
Disaggregation of Revenue [Line Items]
Total revenue	$ 57.8	$ 51.5	$ 143.6	$ 149.6
Revenue as a percentage of total revenue	2.20%	2.00%	1.80%	2.00%
Intersegment Eliminations | Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ (192.2)	$ (180.6)	$ (556.8)	$ (534.6)
Intersegment Eliminations | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ (265.5)	$ (258.8)	$ (776.6)	$ (767.5)