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Pension Plans and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Schedule of net funded status of fully funded, underfunded, and unfunded pension plans The following table presents the funded status of Grace’s pension plans:
(In millions)
March 31,
2019
 
December 31,
2018
Overfunded defined benefit pension plans
$
5.9

 
$
5.7

Underfunded defined benefit pension plans
(67.6
)
 
(67.1
)
Unfunded defined benefit pension plans
(362.9
)
 
(366.0
)
Total underfunded and unfunded defined benefit pension plans
(430.5
)
 
(433.1
)
Pension liabilities included in other current liabilities
(14.6
)
 
(14.7
)
Net funded status
$
(439.2
)
 
$
(442.1
)
Components of net periodic benefit cost (income) The following table presents the components of net periodic benefit cost (income).
 
Three Months Ended March 31,
 
2019
 
2018
(In millions)
U.S.
 
Non-U.S.
 
U.S.
 
Non-U.S.
Service cost
$
3.9

 
$
2.2

 
$
4.8

 
$
2.4

Interest cost
9.6

 
1.3

 
10.3

 
1.3

Expected return on plan assets
(12.0
)
 
(0.2
)
 
(14.5
)
 
(0.3
)
Amortization of prior service credit
(0.2
)
 
—

 
(0.2
)
 
—

Net periodic benefit cost (income)
$
1.3

 
$
3.3

 
$
0.4

 
$
3.4