Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net (loss) income	$ (6.6)	$ 9.4	$ 38.3
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	278.8	270.5	269.8
Change in fair value of derivative instruments	5.8	(2.7)	(1.5)
Amortization of debt issuance costs and original issue discount	5.7	6.1	6.3
Loss on debt extinguishments and modifications	0.0	0.9	3.7
Accretion on landfill retirement obligations	18.0	17.0	15.4
Other accretion and amortization	6.7	4.0	3.5
Provision for doubtful accounts	6.1	5.1	5.4
Loss (gain) on disposition of property and equipment	1.7	(2.5)	1.6
Impairment of assets	0.0	0.0	13.0
Gain on disposition of business	0.0	0.0	(2.8)
Stock based compensation	10.0	11.2	10.2
Deferred tax (benefit) expense	(1.4)	4.6	(41.3)
Earnings in equity investee	(2.4)	(1.2)	(1.6)
Write off of 2012 Veolia acquisition related indemnification receivable	3.9	0.0	0.0
Changes in operating assets and liabilities, net of businesses acquired
Increase in accounts receivable	(1.8)	(15.2)	(17.7)
Increase in prepaid expenses and other current assets	(5.2)	(0.7)	(5.9)
Decrease (increase) in other assets	2.4	(6.5)	2.4
Increase in accounts payable	0.4	19.7	4.1
Increase (decrease) in accrued expenses	3.5	2.7	(2.6)
(Decrease) increase in deferred revenue	(1.2)	1.8	2.2
(Decrease) increase in other long-term liabilities	(25.3)	6.6	(1.7)
Capping, closure and post-closure expenditures	(18.9)	(22.5)	(18.3)
Assumption of long-term care and closure reserve	0.0	0.0	24.0
Net cash provided by operating activities	280.2	308.3	306.5
Cash flows from investing activities
Purchases of property and equipment and construction and development	(203.8)	(188.6)	(186.6)
Proceeds from sale of property and equipment and insurance recoveries	4.8	8.1	4.5
Acquisition of businesses, net of cash acquired	(27.1)	(26.3)	(111.9)
Proceeds from sale of businesses	0.0	0.0	8.7
Net cash used in investing activities	(226.1)	(206.8)	(285.3)
Cash flows from financing activities
Proceeds from borrowings on debt instruments	201.0	136.0	326.2
Repayments on debt instruments including finance/capital leases	(261.3)	(240.6)	(347.0)
Costs associated with debt extinguishments and modifications	0.0	0.0	(1.8)
Proceeds from stock option exercises net of stock repurchases	11.9	3.1	7.0
Net cash used in financing activities	(48.4)	(101.5)	(15.6)
Net increase in cash and cash equivalents	5.7	0.0	5.6
Cash and cash equivalents, beginning of year	6.8	6.8	1.2
Cash and cash equivalents, end of year	$ 12.5	$ 6.8	$ 6.8