Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Defined Contribution Plan [Abstract]

Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan

Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan as of December 31, 2019 are as follows:

Asset Category	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents	$	2.8	$	2.8	$	—	$	—
Investment Account held by Pension Plan(1)	12.2		—		—		12.2
Total	$	15.0	$	2.8	$	—	$	12.2

⁽¹⁾  This category is comprised of investments in insurance contracts.

Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan as of December 31, 2018 are as follows:

Asset Category	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents	$	6.4	$	6.4	$	—	$	—
Investment Account held by Pension Plan(1)	10.8		—		—		10.8
Total	$	17.2	$	6.4	$	—	$	10.8

⁽¹⁾ 

This category is comprised of investments in insurance contracts.

Reconciliation of beginning and ending balances of Level 3 plan assets

A reconciliation of the beginning and ending balances of the Level 3 investments of our U.K. Pension Plan during the years ended December 31 are as follows:

	2019		2018
Fair value at beginning of year	$	10.8	$	11.2
Purchases, sales, issuances and settlements, net	0.2		(0.9		)
Net gain	0.8		1.1
Foreign currency	0.4		(0.6		)
Fair value at end of year	$	12.2	$	10.8

Weighted-average assumptions used to determine benefit obligations and net periodic benefit costs

Weighted-average assumptions used to determine benefit obligations as of December 31 are as follows:

	U.S. Nonqualified Plan				Non-U.S. Pension Benefits				Postretirement Medical Benefits
	2019		2018		2019		2018		2019		2018
Discount rate	3.01	%	3.95	%	2.03	%	2.72	%	3.06	%	3.95	%
Rate of compensation increase	—	%	—	%	—	%	3.50	%	—		—

Weighted-average assumptions used to determine net periodic benefit costs as of December 31 are as follows:

	U.S. Pension Plans						Non-U.S. Pension Benefits						Postretirement Medical Benefits
	2019		2018		2017		2019		2018		2017		2019		2018		2017
Discount rate	3.95	%	3.28	%	3.92	%	2.72	%	2.45	%	2.64	%	3.95	%	3.26	%	3.58	%
Expected long-term rate of return on plan assets	—	%	—	%	5.10	%	3.80	%	3.80	%	3.90	%	—		—		—
Rate of compensation increase	—	%	—	%	—	%	—	%	3.50	%	3.50	%	—		—		—

Accumulated benefit obligations for all defined benefit plans

The accumulated benefit obligations as of December 31 for all defined benefit plans are as follows:

	2019		2018
U.S. Nonqualified Plan	$	1.3	$	1.3
U.K. Pension Plan	10.4		9.3
German Pension Plan	1.0		0.9

Plans with accumulated benefit obligation in excess of plan assets

Information for our plans with an accumulated benefit obligation in excess of plan assets as of December 31 is as follows:

	2019		2018
Accumulated benefit obligation	$	2.3	$	2.2
Fair value of plan assets	—		—

Plans with projected benefit obligations in excess of plan assets

Information for our plans with a projected benefit obligation in excess of plan assets as of December 31 is as follows:

	2019		2018
Projected benefit obligation	$	2.3	$	2.2
Fair value of plan assets	—		—

Assumed healthcare cost trend rates

Assumed healthcare cost trend rates as of December 31 are as follows:

	2019		2018
Healthcare cost trend rate assumption for the next year	6.22	%	6.38	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2032		2032

Effect of one-percentage-point change in assumed healthcare cost trends

To illustrate, a one-percentage-point change in assumed healthcare cost trends would have the following effects:

	1-Percentage- Point Decrease			1-Percentage- Point Increase
Effect on total of service and interest cost components	$	—		$	—
Effect on postretirement benefit obligation	$	(0.5	)	$	0.6

Changes in benefit obligations and plan assets and funded status

Summaries related to changes in benefit obligations and plan assets and to the funded status of our defined benefit and postretirement medical benefit plans are as follows:

	U.S. Nonqualified Plan						Non-U.S. Pension Benefits						Postretirement Medical Benefits
	2019			2018			2019			2018			2019			2018
Change in benefit obligation:
Benefit obligation at beginning of year	$	1.3		$	1.5		$	10.2		$	12.1		$	8.6		$	9.6
Service cost	—			—			—			0.1			—			0.1
Interest cost	0.1			—			0.3			0.3			0.3			0.3
Plan amendments	—			—			—			0.1			—			—
Actuarial loss (gain)	—			—			0.8			(0.5		)	(0.1		)	(0.5		)
Foreign exchange	—			—			0.3			(0.6		)	—			—
Benefits paid	(0.1		)	(0.2		)	(0.2		)	(1.2		)	(1.0		)	(0.9		)
Settlement	—			—			—			—			—			—
Curtailment	—			—			—			(0.1		)	—			—
Benefit obligation at end of year	$	1.3		$	1.3		$	11.4		$	10.2		$	7.8		$	8.6
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year	$	—		$	—		$	10.8		$	11.2		$	—		$	—
Actual return on plan assets	—			—			0.8			1.1			—			—
Employer contributions	0.1			0.2			0.4			0.3			1.0			0.9
Foreign exchange	—			—			0.4			(0.6		)	—			—
Benefits paid	(0.1		)	(0.2		)	(0.2		)	(1.2		)	(1.0		)	(0.9		)
Settlement	—			—			—			—			—			—
Fair value of plan assets at end of year	—			—			12.2			10.8			—			—
Funded status at end of year	$	(1.3	)	$	(1.3	)	$	0.8		$	0.6		$	(7.8	)	$	(8.6	)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	$	—		$	—		$	1.8		$	1.6		$	—		$	—
Current Liabilities	(0.2		)	(0.2		)	—			(0.1		)	(0.7		)	(0.8		)
Long-Term Liabilities	(1.1		)	(1.1		)	(1.0		)	(0.9		)	(7.1		)	(7.8		)
Net accrued (liability) asset	$	(1.3	)	$	(1.3	)	$	0.8		$	0.6		$	(7.8	)	$	(8.6	)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Prior service cost	$	—		$	—		$	(0.1	)	$	(0.1	)	$	—		$	—
Net actuarial (loss) gain	(0.9		)	(0.9		)	(0.4		)	—			0.4			0.4
Accumulated Other Comprehensive (Loss) Income	$	(0.9	)	$	(0.9	)	$	(0.5	)	$	(0.1	)	$	0.4		$	0.4

Components of the net periodic benefit (credit) cost

The components of the net periodic benefit cost (credit) for the three years ended December 31 were as follows:

	U.S. Pension Plans							Non-U.S. Pension Benefits									Postretirement Medical Benefits
	2019		2018		2017			2019			2018			2017			2019			2018		2017
Service cost	$	—	$	—	$	—		$	—		$	0.1		$	0.1		$	—		$	0.1	$	—
Interest cost	0.1		—		1.5			0.3			0.3			0.3			0.3			0.3		0.4
Expected return on plan assets	—		—		(2.3		)	(0.4		)	(0.4		)	(0.4		)	—			—		—
Amortization of net actuarial loss (gain)	—		0.1		—			—			—			0.1			(0.1		)	—		—
Net periodic benefit cost (credit)	0.1		0.1		(0.8		)	(0.1		)	—			0.1			0.2			0.4		0.4
Curtailment	—		—		—			—			(0.1		)	—			—			—		—
Settlement	—		—		6.4			—			—			—			—			—		—
Net benefit cost (credit)	$	0.1	$	0.1	$	5.6		$	(0.1	)	$	(0.1	)	$	0.1		$	0.2		$	0.4	$	0.4

Changes in accumulated other comprehensive loss

The changes in Accumulated Other Comprehensive Loss for the three years ended December 31 were as follows:

	U.S. Pension Plans								Non-U.S. Pension Benefits								Postretirement Medical Benefits
	2019		2018			2017			2019		2018			2017			2019			2018			2017
Prior service cost	$	—	$	—		$	—		$	—	$	0.1		$	—		$	—		$	—		$	—
Net actuarial loss (gain)	0.1		—			1.6			0.4		(1.2		)	(0.5		)	(0.1		)	(0.5		)	(0.5		)
Amortization of net actuarial (loss) gain	—		(0.1		)	—			—		—			(0.1		)	0.1			—			—
Settlement	—		—			(6.4		)	—		—			—			—			—			—
Total recognized in other comprehensive (loss) income	$	0.1	$	(0.1	)	$	(4.8	)	$	0.4	$	(1.1	)	$	(0.6	)	$	—		$	(0.5	)	$	(0.5	)
Total recognized in net benefit cost (credit) and other comprehensive loss (income)	$	0.2	$	—		$	0.8		$	0.3	$	(1.2	)	$	(0.5	)	$	0.2		$	(0.1	)	$	(0.1	)

Expected future benefit payments

The following benefit payments, which reflect expected future service, are expected to be paid for our U.S. Nonqualified and Non-U.S. plans:

	U.S. Nonqualified Plan		Non-U.S. Pension Benefits		Postretirement Medical Benefits
2020	$	0.2	$	0.2	$	0.7
2021	0.1		0.3		0.7
2022	0.1		0.3		0.7
2023	0.1		0.3		0.7
2024	0.1		0.3		0.6
2025 to 2029	0.5		1.6		2.8
Total	$	1.1	$	3.0	$	6.2

Amounts in accumulated other comprehensive loss to be recognized over next fiscal year

The following amounts are included in Accumulated Other Comprehensive Loss as of December 31, 2019 and are expected to be recognized as components of net periodic benefit cost during 2020:

	Pension Benefits		Postretirement Medical Benefits
Net actuarial loss	$	0.1	$	—