Revenue - Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,605.3	$ 2,517.8	$ 5,075.9	$ 4,945.2
Revenue as a percentage of total revenue	100.00%	100.00%	100.00%	100.00%
Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ 151.1	$ 137.0	$ 274.0	$ 255.3
Revenue as a percentage of total revenue	5.80%	5.40%	5.40%	5.20%
Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ 337.5	$ 315.3	$ 634.2	$ 621.8
Revenue as a percentage of total revenue	13.00%	12.50%	12.50%	12.60%
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 128.2	$ 122.8	$ 257.4	$ 253.1
Revenue as a percentage of total revenue	4.90%	4.90%	5.10%	5.10%
Recycling processing and commodity sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 71.9	$ 68.0	$ 144.8	$ 143.8
Revenue as a percentage of total revenue	2.70%	2.70%	2.90%	2.90%
Other non-core
Disaggregation of Revenue [Line Items]
Total revenue	$ 56.3	$ 54.8	$ 112.6	$ 109.3
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	$ 1,947.7	$ 1,892.5	$ 3,824.5	$ 3,716.9
Revenue as a percentage of total revenue	74.70%	75.20%	75.30%	75.10%
Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Total revenue	$ 570.1	$ 560.6	$ 1,127.5	$ 1,109.2
Revenue as a percentage of total revenue	21.90%	22.30%	22.20%	22.40%
Operating Segments | Small-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 792.0	$ 764.5	$ 1,570.0	$ 1,513.6
Revenue as a percentage of total revenue	30.40%	30.40%	30.90%	30.60%
Operating Segments | Large-container
Disaggregation of Revenue [Line Items]
Total revenue	$ 573.9	$ 556.3	$ 1,104.5	$ 1,072.5
Revenue as a percentage of total revenue	22.00%	22.10%	21.80%	21.70%
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 11.7	$ 11.1	$ 22.5	$ 21.6
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	$ 343.7	$ 320.8	$ 638.1	$ 609.3
Operating Segments | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	608.9	580.6	1,145.4	1,130.5
Operating Segments | Energy services
Disaggregation of Revenue [Line Items]
Total revenue	$ 40.8	$ 50.2	$ 85.8	$ 98.1
Revenue as a percentage of total revenue	1.60%	2.00%	1.70%	2.00%
Intersegment Eliminations | Transfer
Disaggregation of Revenue [Line Items]
Total revenue	$ (192.6)	$ (183.8)	$ (364.1)	$ (354.0)
Intersegment Eliminations | Landfill
Disaggregation of Revenue [Line Items]
Total revenue	$ (271.4)	$ (265.3)	$ (511.2)	$ (508.7)