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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

Defined Benefit Plan, Projected Benefit Obligation

The reconciliation of the projected benefit obligations for the plans at December 31, 2021 and 2020 is as follows (in thousands):

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Projected benefit obligation, January 1		$	25,369			$	119,590			$	21,186			$	103,366
Service cost			884				4,577				665				4,519
Employee contributions			1,176				561				1,149				514
Interest cost			559				1,247				711				1,413
Actuarial (gains) losses			(852	)			(5,803	)			2,788				2,624
Benefits paid			(1,178	)			(5,334	)			(1,130	)			(1,474	)
Plan amendments			—				69				—				—
Plan settlements			—				(341	)			—				(1,449	)
Currency impact			—				(7,642	)			—				10,077
Projected benefit obligation, December 31		$	25,958			$	106,924			$	25,369			$	119,590

Defined Benefit Plan, Fair Value of Plan Assets

The reconciliation of the fair value of the plan assets at December 31, 2021 and 2020 is as follows (in thousands):

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Fair value of plan assets, January 1		$	16,168			$	93,890			$	13,773			$	83,011
Actual return on plan assets			1,682				2,739				1,967				1,395
Company contributions			466				5,529				409				3,581
Employee contributions			1,176				561				1,149				514
Plan settlements			—				(341	)			—				(1,449	)
Benefits paid			(1,178	)			(5,334	)			(1,130	)			(1,474	)
Currency impact			—				(5,875	)			—				8,312
Fair value of plan assets, December 31		$	18,314			$	91,169			$	16,168			$	93,890

Defined Benefit, Funded Status of Plan

The summary of the funded status for the plans at December 31, 2021 and 2020 is as follows (in thousands):

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Projected benefit obligation		$	(25,958	)		$	(106,924	)		$	(25,369	)		$	(119,590	)
Fair value of plan assets			18,314				91,169				16,168				93,890
Funded status		$	(7,644	)		$	(15,755	)		$	(9,201	)		$	(25,700	)

Defined Benefit Plan, Amounts Recognized in Balance Sheet

The summary of the amounts recognized in the consolidated balance sheets for the plans at December 31, 2021 and 2020 is as follows (in thousands):

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Long-term assets		$	—			$	1,992			$	—			$	971
Current liabilities			(466	)			—				(409	)			(1,999	)
Long-term liabilities			(7,178	)			(17,747	)			(8,792	)			(24,672	)
Net amount recognized at December 31		$	(7,644	)		$	(15,755	)		$	(9,201	)		$	(25,700	)

Summary of the Non-U.S. Pension Plans

The summary of the Non-U.S. Pension Plans that have accumulated benefit obligations in excess of plan assets at December 31, 2021 and 2020 is as follows (in thousands):

		2021				2020
Accumulated benefit obligations		$	75,178			$	84,940
Fair value of plan assets		$	66,414			$	68,334

The summary of the Non-U.S. Pension Plans that have projected benefit obligations in excess of plan assets at December 31, 2021 and 2020 is as follows (in thousands):

		2021				2020
Projected benefit obligations		$	96,010			$	107,093
Fair value of plan assets		$	78,264			$	80,422

Defined Benefit Plan, Net Periodic Benefit Cost

The summary of the components of net periodic pension costs for the plans for the years ended December 31, 2021, 2020 and 2019 is as follows (in thousands):

		2021												2020												2019
		U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Service cost		$	—			$	884			$	4,577			$	—			$	665			$	4,519			$	—			$	499			$	4,339
Interest cost			—				559				1,247				—				711				1,413				29				777				1,735
Expected return on plan assets			—				(1,011	)			(1,835	)			—				(871	)			(1,874	)			—				(706	)			(2,154	)
Settlement loss			—				—				77				—				—				235				27				—				1,548
Net amortization:
Prior service credit			—				(19	)			(87	)			—				(19	)			(163	)			—				(19	)			(108	)
Net actuarial loss			—				10				1,186				—				—				1,571				—				—				531
Net periodic pension cost		$	—			$	423			$	5,165			$	—			$	486			$	5,701			$	56			$	551			$	5,891

Defined Beneift Plan, Amounts Recognized in Other Comprehensive Income (Loss)

The summary of the changes in amounts recognized in other comprehensive income (loss) for the plans for the years ended December 31, 2021, 2020 and 2019 is as follows (in thousands):

		2021												2020												2019
		U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Prior service credit		$	—			$	—			$	(69	)		$	—			$	—			$	—			$	—			$	—			$	—
Net gain (loss) arising during the year			—				1,524				6,708				—				(1,692	)			(3,104	)			32				(648	)			(8,940	)
Amortization:
Prior service credit			—				(19	)			(87	)			—				(19	)			(163	)			—				(19	)			(108	)
Net loss			—				10				1,263				—				—				1,806				27				—				2,079
Other Plans			—				—				—				—				—				—				—				—				18
Currency impact			—				—				1,179				—				—				(2,225	)			—				—				178
Total recognized in other comprehensive income (loss)		$	—			$	1,515			$	8,994			$	—			$	(1,711	)		$	(3,686	)		$	59			$	(667	)		$	(6,773	)

Defined Benefit Plan, Accumulated Other Comprehensive Income

The summary of the amounts included in accumulated other comprehensive loss in stockholders’ equity for the plans at December 31, 2021 and 2020 is as follows (in thousands):

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Net actuarial loss		$	(889	)		$	(14,938	)		$	(2,423	)		$	(24,138	)
Prior service credit			55				152				74				358
Total		$	(834	)		$	(14,786	)		$	(2,349	)		$	(23,780	)

Defined Benefit Plan, Actual Plan Asset Allocations

The plans’ investment asset mix is as follows at December 31, 2021 and 2020:

		2021								2020
		U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans				U.S. Retiree Healthcare Plan				Non-U.S. Pension Plans
Equity securities			77	%			8	%			67	%			5	%
Debt securities			23	%			18	%			33	%			20	%
Cash and cash equivalents			0	%			1	%			0	%			1	%
Insurance contracts and other			0	%			73	%			0	%			74	%
Total			100	%			100	%			100	%			100	%

Defined Benefit Plan, Target Asset Allocations

The plans’ investment policies include the following asset allocation guidelines:

		U.S. Retiree Healthcare Plan								Non-U.S. Pension Plans Policy Target
		Policy Target				Range
Equity securities			60	%			30% -  90%				13	%
Debt securities			35	%			20% -  50%				19	%
Cash and cash equivalents			0	%			0% -  10%				8	%
Insurance contracts and other			5	%			0% -  10%				60	%

Defined Benefit Plan, Fair Value Measurement of Plan Assets

The fair value of the Company’s retirement plan assets are as follows at December 31, 2021 (in thousands):

		Total at December 31, 2021				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
U.S. Retiree Healthcare Plan:
Mutual funds(a)			18,314				18,314				—				—
Total U.S. Retiree Healthcare Plan			18,314				18,314				—				—
Non-U.S. Pension Plans:
Cash equivalents(b)			1,333				1,333				—				—
Mutual funds(c)			23,891				23,891				—				—
Bank and insurance investment contracts(d)			65,945				—				—				65,945
Total Non-U.S. Pension Plans			91,169				25,224				—				65,945
Total fair value of retirement plan assets		$	109,483			$	43,538			$	—			$	65,945

The fair value of the Company’s retirement plan assets are as follows at December 31, 2020 (in thousands):

		Total at December 31, 2020				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
U.S. Retiree Healthcare Plan:
Mutual funds(e)			16,168				16,168				—				—
Total U.S. Retiree Healthcare Plan			16,168				16,168				—				—
Non-U.S. Pension Plans:
Cash equivalents(b)			1,188				1,188				—				—
Mutual funds(f)			23,582				23,582				—				—
Bank and insurance investment contracts(d)			69,120				—				—				69,120
Total Non-U.S. Pension Plans			93,890				24,770				—				69,120
Total fair value of retirement plan assets		$	110,058			$	40,938			$	—			$	69,120

(a) The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 48% in the common stock of large-cap U.S. companies, 29% in the common stock of international growth companies and 23% in fixed income bonds of U.S. companies and the U.S. government.

(b) Primarily represents deposit account funds held with various financial institutions.

(c) The mutual fund balance in the Non-U.S. Pension Plans is primarily invested in the following categories: 58% in international bonds, 31% in the common stock of international companies and 11% in various other global investments.

(d) Amount represents bank and insurance guaranteed investment contracts.

(e) The mutual fund balance in the U.S. Retiree Healthcare Plan is invested in the following categories: 36% in the common stock of large-cap U.S. companies, 31% in the common stock of international growth companies and 33% in fixed income bonds of U.S. companies and the U.S. government.

(f) The mutual fund balance in the Non-U.S. Pension Plans is invested in the following categories: 64% in international bonds, 19% in the common stock of international companies and 17% in various other global investments.

Defined Benefit Plan, Fair Value of Plan Assets, Unobservable Input Reconciliation

The following table summarizes the changes in fair value of the Level 3 retirement plan assets for the years ended December 31, 2021 and 2020 (in thousands):

		Insurance Guaranteed Investment Contracts
Fair value of assets, December 31, 2019		$	60,119
Net purchases (sales) and appreciation (depreciation)			9,001
Fair value of assets, December 31, 2020			69,120
Net purchases (sales) and appreciation (depreciation)			(3,175	)
Fair value of assets, December 31, 2021		$	65,945

Defined Benefit Plan, Weighted-Average Assumptions Used in Calculating Benefit Obligation

The weighted-average assumptions used to determine the benefit obligation in the consolidated balance sheets at December 31, 2021, 2020 and 2019 are as follows:

		2021								2020								2019
		U.S.				Non-U.S.				U.S.				Non-U.S.				U.S.				Non-U.S.
Discount rate			2.70	%			1.40	%			2.25	%			1.12	%			3.42	%			1.38	%
Increases in compensation levels			*	*			2.74	%			*	*			2.69	%			*	*			2.83	%
Interest crediting rate			5.25	%			0.99	%			5.25	%			0.85	%			5.25	%			0.79	%

** Not applicable

Defined Benefit Plan, Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost

The weighted-average assumptions used to determine the net periodic pension cost for the years ended December 31, 2021, 2020 and 2019 are as follows:

		2021								2020								2019
		U.S.				Non-U.S.				U.S.				Non-U.S.				U.S.				Non-U.S.
Discount rate			2.25	%			1.40	%			3.42	%			1.98	%			4.41	%			2.25	%
Return on plan assets			6.25	%			2.58	%			6.25	%			2.99	%			6.25	%			3.11	%
Increases in compensation levels			*	*			3.11	%			*	*			3.62	%			*	*			3.20	%
Interest crediting rate			5.25	%			0.77	%			5.25	%			0.63	%			5.25	%			0.58	%

** Not applicable

Defined Benefit Plan, Estimated Future Benefit Payments

During fiscal year 2022, the Company expects to contribute a total of approximately $3 million to $6 million to the Company’s defined benefit plans. Estimated future benefit payments from the plans as of December 31, 2021 are as follows (in thousands):

		U.S. Retiree Healthcare Plans				Non-U.S. Pension Plans				Total
2022		$	1,452			$	4,090			$	5,542
2023			1,554				2,285				3,839
2024			1,643				2,635				4,278
2025			1,703				3,815				5,518
2026			1,726				3,093				4,819
2027 - 2031			8,358				23,408				31,766

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This element represents the disclosure related to defined benefit plan assets, including financial instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

No definition available.

+ Details

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Namespace Prefix:	wat_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of target asset investment allocations, including the target ranges.

+ References

No definition available.

+ Details

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Namespace Prefix:	wat_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	wat_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	wat_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration