Changes in the goodwill balance from December 31, 2019 through April 3, 2020 were as follows (in millions):


Net balance as of December 31, 2019	$	1,659.2
Addition due to business combination	4.2

Net balance as of April 3, 2020	$	1,663.4

Goodwill is tested for impairment annually on the first day of the fourth quarter or more frequently if events or changes in circumstances (each, a "triggering event") would more likely than not reduce the carrying value of goodwill below its fair value. Management considered the general economic decline and the impact of the COVID-19 pandemic, but did not identify any triggering events during the quarter ended April 3, 2020 that would require an interim impairment analysis.

Details of Inventory included in the Company’s Consolidated Balance Sheets are as follows (in millions):


	As of
	April 3, 2020		December 31, 2019
Inventories:
Raw materials	$	142.7	$	138.4
Work in process	808.6		772.9
Finished goods	300.6		321.1
	$	1,251.9	$	1,232.4

As of April 3, 2020, the total accrued pension liability for underfunded plans was $133.2 million, of which the current portion of $0.3 million was classified as accrued expenses and other current liabilities. As of December 31, 2019, the total accrued pension liability for underfunded plans was $132.7 million, of which the current portion of $0.3 million was classified as accrued expenses and other current liabilities.


	Quarters Ended
	April 3, 2020		March 29, 2019
Service cost	$	2.7	$	2.3
Interest cost	1.1		1.3
Expected return on plan assets	(1.5)		(1.5)



Total net periodic pension cost	$	2.3	$	2.1

Operating lease arrangements are comprised primarily of real estate and equipment agreements. The components of lease expense are as follows (in millions):


	Quarters Ended
	April 3, 2020		March 29, 2019
Operating lease	$	9.1	$	8.3
Variable lease	1.1		1.2
Short-term lease	1.1		0.7
Total lease expense	$	11.3	$	10.2

The lease liabilities recognized in the Consolidated Balance Sheets are as follows (in millions):


	As of
	April 3, 2020		December 31, 2019
Accrued expenses and other current liabilities	$	27.6	$	26.1
Other long-term liabilities	87.8		87.9
	$	115.4	$	114.0

Operating lease assets of $111.5 million and $110.2 million are included in other assets in the Consolidated Balance Sheets as of April 3, 2020 and December 31, 2019, respectively. As of April 3, 2020, the weighted-average remaining lease-term was 6.3 years and the weighted-average discount rate was 5.5%.


	Quarters Ended
	April 3, 2020		March 29, 2019
Non-cash financing activity:
Liability incurred for purchase of business	$	7.7	$	—
Non-cash activities:



Capital expenditures in accounts payable and other liabilities	$	123.5	$	207.2

Right-of-use assets obtained in exchange of lease liabilities	8.8		4.1
Cash (received) paid for:
Interest income	$	(1.9)	$	(2.5)
Interest expense	24.5		15.4
Income taxes	9.9		15.6
Operating lease payments in operating cash flows	8.2		9.5

Reconciliation of the captions in the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows (in millions):


	As of
	April 3, 2020		December 31, 2019		March 29, 2019		December 31, 2018
Consolidated Balance Sheets:
Cash and cash equivalents	$	1,982.0	$	894.2	$	939.6	$	1,069.6
Restricted cash (included in other current assets)	—		—		17.5		17.5
Cash, cash equivalents and restricted cash in Consolidated Statements of Cash Flows	$	1,982.0	$	894.2	$	957.1	$	1,087.1

The restricted cash balance, which included the consideration held in escrow for the acquisition of Aptina in 2014, was released during the year ended December 31, 2019 upon satisfaction of certain outstanding items contained in the merger agreement for such acquisition.