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.

Net periodic benefit costs of our defined benefit retirement plans for the three months ended March 31, 2019 and 2018 were as follows:

	Quarter Ended March 31,
(In millions)	2019		2018
U.S. Nonqualified Defined Benefit Retirement Plans
Service cost	$	0.3	$	0.3
Interest cost		0.2	0.1
Net periodic benefit cost	$	0.5	$	0.4

(In millions)	March 31, 2019		December 31, 2018
Amounts recognized on the balance sheet:
Accrued liabilities	$	1.0	$	0.9
Other non-current liabilities		18.3		17.2
	$	19.3	$	18.1

	Quarter Ended March 31,
(In millions)	2019			2018
European Defined Benefit Retirement Plans
Service cost	$	0.3		$	0.3
Interest cost		1.1		1.1
Expected return on plan assets		(2.2	)		(2.4	)
Net amortization and deferral		0.1			0.1
Net periodic benefit credit	$	(0.7	)	$	(0.9	)

(In millions)	March 31, 2019		December 31, 2018
Amounts recognized on the balance sheet:
Noncurrent asset	$	46.6	$	42.6

Accrued liabilities		1.2		0.4
Other non-current liabilities		20.0		18.8
Total accrued benefit	$	21.2	$	19.2

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, 2019 and 2018, amounts unrelated to service costs were a benefit of $0.8 million and $1.1 million, respectively.

We generally fund our U.S. non-qualified defined benefit retirement plans when benefit payments are incurred. We have contributed approximately $0.2 million in the first three months of 2019 to cover unfunded benefits. We expect to contribute a total of $0.9 million in 2019 to cover unfunded benefits. We contributed $0.1 million to our U.S. non-qualified defined benefit retirement plans during the quarter ended March 31, 2018.

We contributed $1.2 million and $1.6 million to our European defined benefit retirement plans in the three months ended March 31, 2019 and 2018, respectively. We plan to contribute approximately $5.0 million during 2019 to our European plans.

We recorded $0.3 million of net amortization gain deferral for the quarters ended March 31, 2019 and March 31, 2018. Net periodic benefit costs of our postretirement health care and life insurance benefit plans for the three months ended March 31, 2019 and 2018 were immaterial.

(In millions)	March 31, 2019		December 31, 2018
Amounts recognized on the balance sheet:
Accrued liabilities	$	0.5	$	0.5
Other non-current liabilities	3.9		2.8
Total accrued benefit	$	4.4	$	3.3

Amounts contributed in connection with our postretirement plans, were immaterial for both the three months ended March 31, 2019 and March 31, 2018. We periodically fund our postretirement plans to pay covered expenses as they are incurred. We expect to contribute less than $0.5 million in 2019 to cover unfunded benefits.