Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum lease obligations under non-cancellable operating leases

Future minimum lease obligations under non-cancelable operating leases with initial terms in excess of one year as of December 31, 2018 are as follows:

2019	$	38.7
2020	35.1
2021	32.1
2022	27.7
2023	26.2
Thereafter	129.2
	$	289.0

Schedule of future minimum payments under unconditional purchase commitments

Future minimum payments under unconditional purchase commitments, consisting primarily of (1) disposal related agreements, which include fixed or minimum royalty payments, host agreements, and take-or-pay and put-or-pay agreements, and (2) other obligations including committed capital expenditures and consulting service agreements as of December 31, 2018 are as follows:

2019	$	350.8
2020	83.0
2021	46.1
2022	38.5
2023	30.8
Thereafter	341.6
	$	890.8

Schedule of financial instruments and collateral in place

We had the following financial instruments and collateral in place to secure our financial assurances as of December 31:

	2018		2017
Letters of credit	$	474.2	$	490.3
Surety bonds	3,418.5		3,307.3

Schedule of restricted cash and marketable securities

The following table summarizes our restricted cash and marketable securities as of December 31:

	2018		2017
Financing proceeds	$	—	$	38.6
Capping, closure and post-closure obligations	29.5		28.6
Insurance	78.6		71.4
Other	—		2.5
Total restricted cash and marketable securities	$	108.1	$	141.1