Leases

12 Months Ended

Dec. 31, 2019

As of December 31, 2019, operating ROU assets and lease liabilities were $34.0 and $34.1 ($6.3 of which was current), respectively. The weighted-average remaining term for lease contracts was 6.7 years at December 31, 2019, with maturity dates ranging from May 2020 to February 2029. The weighted-average discount rate was 4.7% at December 31, 2019.

We incurred $11.1, $8.0, and $9.3 of rental expense under operating leases for the years ended December 31, 2019, 2018 and 2017, respectively. Certain operating leases contain rent escalation clauses and lease concessions that require additional rental payments in the later years of the term. Rent expense for these types of leases is recognized on a straight-line basis over the minimum lease term. Adjustments for straight-line rental expense for the respective periods was not material and as such, the majority of expense recognized was reflected in cash used in operating activities for the respective periods. This expense consisted primarily of payments for base rent on building and equipment leases. Payments related to short-term lease costs and taxes and variable service charges on leased properties were immaterial. In addition, we have the right, but no obligation, to renew certain leases for various renewal terms.

The following table summarizes future minimum lease payments for non-cancelable operating leases as of December 31, 2019:



2020	$	7.8
2021	6.4
2022	6.1
2023	5.6
2024	5.3
Thereafter ⁽¹⁾	7.9
Total future minimum lease payments	$	39.1

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As of December 31, 2019, future minimum lease payments for non-cancelable operating leases for period subsequent to 2024 relate to 7 leased facilities.