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Leases

3 Months Ended

Mar. 31, 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 March 31,
	2023		2022
Operating lease cost:
Amortization of right-of-use assets	$	1.1	$	1.4
Interest on lease liabilities	0.2		0.3
Total operating lease cost	$	1.3	$	1.7

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	March 31, 2023			December 31, 2022
Operating lease right-of-use assets	Other assets	$	15.5		$	19.4

Operating lease liabilities, current portion	Other current liabilities	$	3.4		$	5.8
Operating lease liabilities	Other liabilities	13.0			14.8
Total operating lease liabilities		$	16.4		$	20.6

Operating leases:
Weighted average remaining lease term (years)		6.6			5.9
Weighted average discount rate		4.1		%	4.1		%