Purchase obligations of the Company as of December 31, 2019 were $408.5 million, of which $373.9 million is due within one year. Purchase obligations include contracts for raw materials and finished goods purchases, selling and administrative services, and capital expenditures.

Future minimum rental payments under non-cancelable operating leases as of December 31, 2018 were as follows:

(In millions)
2019	$	37.8
2020		29.6
2021		23.4
2022		18.9
2023		13.8
Remainder		58.8
Total minimum rental payments	$	182.3

Total rental expense for all operating leases (reduced by immaterial amounts from subleases) amount to $48.4 million and $42.1 million in 2018 and 2017, respectively. These expenses and minimum rental payments were determined in accordance with the previous leasing guidance (ASC 840). Accordingly, the minimum payments exclude optional lease payments that we can avoid. The minimum lease payments as of December 31, 2019, disclosed in Note 7, are determined in accordance with the new leasing guidance (ASC 842), which include optional lease payments if we are reasonably certain to incur them.

We generally record warranty expense related to contractual warranty terms at the time of sale. We may also provide customer concessions for claims made outside of the contractual warranty terms and those expenses are recorded in the period in which the concession is made. We offer our customers various warranty terms based on the type of product that is sold. Warranty expense is determined based on historic claim experience and the nature of the product category. The following table summarizes activity related to our product warranty liability for the years ended December 31, 2019, 2018 and 2017.

(In millions)	2019			2018			2017
Reserve balance at the beginning of the year	$	24.9		$	17.2		$	16.2
Provision for warranties issued		25.4			25.1			25.1
Settlements made (in cash or in kind)		(25.8	)		(25.7	)		(24.3	)
Acquisition		—			8.9			—
Foreign currency		0.2			(0.6	)		0.2
Reserve balance at end of year	$	24.7		$	24.9		$	17.2