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Leases

6 Months Ended

Jun. 30, 2023

The Company is the lessee for operating leases for offices, R&D facilities and manufacturing facilities. The Company determines if an arrangement is a lease at inception. Operating leases are included in right-of-use assets and liabilities. For a discussion of lessor activities, see Note 13, "Revenue recognition."

The components of lease expense were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Operating lease cost:
Amortization of right-of-use assets	$	0.9	$	1.4	$	2.0	$	2.8
Interest on lease liabilities	0.2		0.3		0.4		0.6
Total operating lease cost	$	1.1	$	1.7	$	2.4	$	3.4

Operating lease costs are reflected as components of cost of product sales, cost of contract development and manufacturing, R&D expense and selling, general and administrative expense.

Supplemental balance sheet information related to lessee activities is as follows:


Leases	Classification	June 30, 2023			December 31, 2022
Operating lease right-of-use assets	Other assets	$	15.7		$	19.4

Operating lease liabilities, current portion	Other current liabilities	$	3.6		$	5.8
Operating lease liabilities	Other liabilities	13.1			14.8
Total operating lease liabilities		$	16.7		$	20.6

Operating leases:
Weighted average remaining lease term (years)		6.3			5.9
Weighted average discount rate		4.5		%	4.1		%