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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Employee Retirement Plans
16. Employee Retirement Plans

The following table presents the components of Net periodic benefit cost for the periods presented (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Service cost - benefits earning during the period
 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
1.3

 
1.4

 
2.7

 
2.7

Expected return on assets
 
(1.7
)
 
(2.0
)
 
(3.4
)
 
(3.9
)
Actuarial gain
 
—

 
—

 
—

 
—

Foreign currency gain (loss)
 
—

 
—

 
—

 
—

Net periodic benefit
 
$
(0.4
)
 
$
(0.6
)
 
$
(0.7
)
 
$
(1.2
)


For the three months ended June 30, 2019, $1.7 million of contributions have been made to the Company's pension plans, comprising $1.7 million of fixed contributions. For the six months ended June 30, 2019, $3.7 million of contributions have been made to the Company's pension plans, comprising $3.4 million of fixed contributions and $0.3 million of variable contributions. The Company anticipates contributing an additional $3.9 million during 2019, comprising $3.9 million of fixed contributions.

Under a revised deficit recovery plan agreed between GMSL and the trustees of GMSL's pension plan dated March 20, 2018, which was subsequently submitted to the UK government’s Pension Regulator, contributions of approximately $12.7 million deferred from 2016 and 2017 due in December 2017 were further deferred. To support this second deferral, the Company provided secured assets. These are the CWind Phantom (crew transfer vessel) and Q1000 trencher. Consistent with earlier recovery plans, the revised deficit recovery plan comprises three elements: fixed contributions, variable contributions (profit-related element) and variable contributions (dividend-related element), though the amounts and some definitions have been modified. The fixed contributions, payable in installments, comprise approximately $6.6 million in 2019, approximately $6.8 million in 2020, approximately $7.0 million in 2021 and approximately $3.0 million in 2022. The variable contributions (profit-related element) are calculated as 10% of GMSL's audited operating profit and paid two years in arrears in December each year from 2018. The variable contributions (dividend-related) equate to 50% of any future dividend paid by GMSL.