Leases

The Company leases various property, plant and equipment under non-cancelable operating leases, subject to certain provisions for renewal options and escalation clauses. Terms of the leases vary, but generally require the Company to pay property taxes, insurance premiums and maintenance costs associated with the leased property. Rental expense attributable to operating leases was $17.1 million, $12.8 million and $11.2 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Future minimum rental obligations under non-cancelable operating leases as of December 31, 2017 are payable as follows:



(in millions)
Year ending December 31:
2018	$	13.3
2019	11.2
2020	7.6
2021	5.1
2022	3.4
Thereafter	2.9
	$	43.5