Revenue (Revenue by Service Line) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 11,295.0	$ 10,153.6	$ 10,299.4
Revenue as a percentage of total revenue	1.000	1.000	1.000
Transfer
Disaggregation of Revenue [Line Items]
Revenue	$ 675.6	$ 603.5	$ 570.6
Revenue as a percentage of total revenue	0.060	0.059	0.055
Landfill
Disaggregation of Revenue [Line Items]
Revenue	$ 1,413.9	$ 1,279.6	$ 1,300.1
Revenue as a percentage of total revenue	0.125	0.126	0.126
Environmental Solutions Service Line
Disaggregation of Revenue [Line Items]
Revenue	$ 202.5	$ 127.7	$ 191.7
Revenue as a percentage of total revenue	0.018	0.013	0.019
Recycling processing and commodity sales
Disaggregation of Revenue [Line Items]
Revenue	$ 420.5	$ 297.1	$ 273.3
Revenue as a percentage of total revenue	0.037	0.029	0.027
Other non-core
Disaggregation of Revenue [Line Items]
Revenue	$ 274.0	$ 229.5	$ 226.1
Revenue as a percentage of total revenue	0.024	0.023	0.022
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 694.5	$ 526.6	$ 499.4
Revenue as a percentage of total revenue	0.061	0.052	0.049
Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenue	$ 2,452.8	$ 2,309.0	$ 2,271.9
Revenue as a percentage of total revenue	0.217	0.227	0.221
Operating Segments | Small-container
Disaggregation of Revenue [Line Items]
Revenue	$ 3,417.7	$ 3,106.8	$ 3,170.0
Revenue as a percentage of total revenue	0.303	0.306	0.308
Operating Segments | Large-container
Disaggregation of Revenue [Line Items]
Revenue	$ 2,378.4	$ 2,148.9	$ 2,249.6
Revenue as a percentage of total revenue	0.211	0.212	0.218
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 59.6	$ 51.5	$ 46.1
Revenue as a percentage of total revenue	0.005	0.005	0.004
Operating Segments | Collection Service Line
Disaggregation of Revenue [Line Items]
Revenue	$ 8,308.5	$ 7,616.2	$ 7,737.6
Revenue as a percentage of total revenue	0.736	0.750	0.751
Operating Segments | Transfer
Disaggregation of Revenue [Line Items]
Revenue	$ 1,490.0	$ 1,349.4	$ 1,318.7
Operating Segments | Landfill
Disaggregation of Revenue [Line Items]
Revenue	2,506.7	2,298.1	2,324.2
Intersegment Eliminations | Transfer
Disaggregation of Revenue [Line Items]
Revenue	(814.4)	(745.9)	(748.1)
Intersegment Eliminations | Landfill
Disaggregation of Revenue [Line Items]
Revenue	$ (1,092.8)	$ (1,018.5)	$ (1,024.1)