Note 4 — Retirement and Other Postretirement Benefit Plans

We maintain qualified and nonqualified defined benefit retirement plans covering certain current and former U.S. and European employees, retirement savings plans covering eligible U.S. and U.K. employees and certain postretirement health care and life insurance benefit plans covering eligible U.S. retirees. We also participate in a union sponsored multi-employer pension plan covering certain U.S. employees with union affiliations.

Defined Benefit Retirement Plans

Net Periodic Benefit Costs

Net periodic benefit costs of our defined benefit retirement plans for the quarter ended March 31, 2018 and 2017 were as follows:

	Quarter Ended March 31,
(In millions)	2018		2017
U.S. Nonqualified Defined Benefit Retirement Plans
Service cost	$	0.3	$	0.3
Interest cost	0.1		0.2
Net amortization and deferral	―		0.1
Net periodic benefit cost	$	0.4	$	0.6

(In millions)	March 31, 2018		December 31, 2017
Amounts recognized on the balance sheet:
Accrued liabilities	$	4.8	$	4.5
Other non-current liabilities		17.1	16.9
	$	21.9	$	21.4

	Quarter Ended March 31,
(In millions)	2018			2017
European Defined Benefit Retirement Plans
Service cost	$	0.3		$	0.2
Interest cost	1.1			1.1
Expected return on plan assets		(2.4	)		(2.0	)
Net amortization and deferral		0.1		0.1
Net periodic benefit credit	$	(0.9	)	$	(0.6	)

(In millions)	March 31, 2018		December 31, 2017
Amounts recognized on the balance sheet:
Noncurrent asset	$	36.6	$	32.2

Accrued liabilities		1.1		0.3
Other non-current liabilities		21.7		19.6
Total accrued benefit	$	22.8	$	19.9

All costs related to our pensions are included as a component of operating income in our consolidated statements of operations. For the three months ended March 31, 2018 and 2017, amounts unrelated to service costs were a benefit of $1.1 million and $0.5 million, respectively.

Contributions

We generally fund our U.S. non-qualified defined benefit retirement plans when benefit payments are incurred. We have contributed approximately $0.1 million in the first three months of 2018 to cover unfunded benefits. We expect to contribute a total of $4.6 million in 2018 to cover unfunded benefits. We contributed $0.1 million to our U.S. non-qualified defined benefit retirement plans during the first quarter of 2017.

We contributed $1.6 million and $1.3 million to our European defined benefit retirement plans in the first quarters of 2018 and 2017, respectively. We plan to contribute approximately $5.0 million during 2018 to our European plans.

Postretirement Health Care and Life Insurance Benefit Plans

We recorded $0.3 million of net amortization gain deferral for the quarter ended March 31, 2018. Net periodic benefit costs of our postretirement health care and life insurance benefit plans for the quarters ended March 31, 2018 and 2017 were not material.

(In millions)	March 31, 2018		December 31, 2017
Amounts recognized on the balance sheet:
Accrued liabilities	$	0.5	$	0.5
Other non-current liabilities	3.9		3.6
Total accrued benefit	$	4.4	$	4.1

In connection with our postretirement plans, we contributed about $0.1 million during the quarters ended March 31, 2018 and 2017. We periodically fund our postretirement plans to pay covered expenses as they are incurred. We expect to contribute approximately $0.2 million in 2018 to cover unfunded benefits.