Leases

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Leases

Leases

The Company is the lessee for operating corporate 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 ("ROU") assets and liabilities. For a discussion of lessor activities, see Note 12, "Revenue recognition".

The components of lease expense were as follows:

	Year Ended December 31,
	2022		2021		2020
Operating lease cost:
Amortization of right-of-use assets	$	5.6	$	5.6	$	4.5
Interest on lease liabilities	1.1		1.3		1.1
Total operating lease cost	$	6.7	$	6.9	$	5.6

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

Supplemental balance sheet information related to leases was as follows:

		December 31,
Leases	Classification	2022			2021
Operating lease right-of-use assets	Other assets	$	19.4		$	28.3
Operating lease liabilities, current portion	Other current liabilities	$	5.8		$	5.8
Operating lease liabilities	Other liabilities	14.8			24.2
Total operating lease liabilities		$	20.6		$	30.0
Operating leases:
Weighted average remaining lease term (years)		5.9			7.0
Weighted average discount rate		4.1		%	4.1		%

During the year ended December 31, 2022, the Company exercised the option to purchase its Rockville manufacturing facility. As a result, the Company removed the related operating lease right-of-use asset and operating lease liability of $3.5 million and $3.4 million, respectively. The purchased assets have been properly included in "Property, plant and equipment, net" on the Company's consolidated balance sheet as of December 31, 2022.

The Company's leases have remaining lease terms of less than one year to approximately 11 years, some of which include options to extend the leases for up to five years, and some of which include options to terminate the leases within one year.

Lease maturities as of December 31, 2022, are as follows:

Year	As of December 31, 2022
2023	$	6.5
2024	4.3
2025	2.7
2026	2.3
2027	1.8
Thereafter	5.9
Total undiscounted lease liabilities	23.5
Less: Imputed interest	2.9
Total Lease liabilities	$	20.6