Revenue (Revenue by Service Line) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,530.0	$ 2,565.7	$ 2,517.8	$ 2,427.5	$ 2,560.0	$ 2,562.0	$ 2,526.7	$ 2,392.8	$ 10,040.9	$ 10,041.5	$ 9,387.7
Revenue as a percentage of total revenue									1.000	1.000	1.000
Transfer
Disaggregation of Revenue [Line Items]
Total revenue									$ 537.5	$ 505.7	$ 463.5
Revenue as a percentage of total revenue									0.054	0.050	0.049
Landfill
Disaggregation of Revenue [Line Items]
Total revenue									$ 1,270.9	$ 1,238.8	$ 1,121.2
Revenue as a percentage of total revenue									0.127	0.123	0.119
Other
Disaggregation of Revenue [Line Items]
Total revenue									$ 520.3	$ 734.6	$ 595.4
Revenue as a percentage of total revenue									0.051	0.074	0.064
Recycling processing and commodity sales
Disaggregation of Revenue [Line Items]
Total revenue									$ 298.0	$ 539.2	$ 420.4
Revenue as a percentage of total revenue									0.030	0.054	0.045
Other non-core
Disaggregation of Revenue [Line Items]
Total revenue									$ 222.3	$ 195.4	$ 175.0
Revenue as a percentage of total revenue									0.021	0.020	0.019
Operating Segments | Collection
Disaggregation of Revenue [Line Items]
Total revenue									$ 7,517.5	$ 7,413.4	$ 7,131.2
Revenue as a percentage of total revenue									0.749	0.738	0.760
Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Total revenue									$ 2,235.1	$ 2,285.7	$ 2,239.7
Revenue as a percentage of total revenue									0.223	0.228	0.239
Operating Segments | Small-container
Disaggregation of Revenue [Line Items]
Total revenue									$ 3,057.5	$ 2,995.6	$ 2,877.5
Revenue as a percentage of total revenue									0.305	0.298	0.307
Operating Segments | Large-container
Disaggregation of Revenue [Line Items]
Total revenue									$ 2,181.1	$ 2,087.9	$ 1,975.8
Revenue as a percentage of total revenue									0.217	0.208	0.210
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total revenue									$ 43.8	$ 44.2	$ 38.2
Revenue as a percentage of total revenue									0.004	0.004	0.004
Operating Segments | Transfer
Disaggregation of Revenue [Line Items]
Total revenue									$ 1,243.9	$ 1,209.5	$ 1,157.6
Operating Segments | Landfill
Disaggregation of Revenue [Line Items]
Total revenue									2,291.7	2,224.3	2,083.6
Operating Segments | Energy services
Disaggregation of Revenue [Line Items]
Total revenue									$ 194.7	$ 149.0	$ 76.4
Revenue as a percentage of total revenue									0.019	0.015	0.008
Intersegment Eliminations | Transfer
Disaggregation of Revenue [Line Items]
Total revenue									$ (706.4)	$ (703.8)	$ (694.1)
Intersegment Eliminations | Landfill
Disaggregation of Revenue [Line Items]
Total revenue									$ (1,020.8)	$ (985.5)	$ (962.4)