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Pension Plans and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Pension plans and other postretirement benefit plans  
Schedule of net funded status of fully funded, underfunded, and unfunded pension plans
The following table presents the funded status of Grace's fully-funded, underfunded, and unfunded pension plans:
(In millions)
September 30,
2016
 
December 31,
2015
Overfunded defined benefit pension plans
$
0.4

 
$
—

Underfunded defined benefit pension plans
(70.3
)
 
(73.2
)
Unfunded defined benefit pension plans
(308.7
)
 
(304.3
)
Total underfunded and unfunded defined benefit pension plans
(379.0
)
 
(377.5
)
Pension liabilities included in other current liabilities
(14.3
)
 
(14.2
)
Net funded status
$
(392.9
)
 
$
(391.7
)
Components of net periodic benefit cost (income)
 
Three Months Ended September 30,
 
2016
 
2015
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
4.5

 
$
1.7

 
$
—

 
$
6.4

 
$
3.0

 
$
—

Interest cost
10.1

 
1.3

 
—

 
13.7

 
4.1

 
—

Expected return on plan assets
(14.2
)
 
(0.2
)
 
—

 
(17.6
)
 
(3.3
)
 
—

Amortization of prior service (credit) cost
(0.1
)
 
—

 
(0.5
)
 
0.1

 
—

 
(0.9
)
Amortization of net deferred actuarial loss
—

 
—

 
0.1

 
—

 
—

 
0.2

Curtailment gain
—

 
(0.2
)
 
—

 
—

 
—

 
(4.5
)
Net periodic benefit cost (income)
0.3

 
2.6

 
(0.4
)
 
2.6

 
3.8

 
(5.2
)
Less: discontinued operations
—

 
—

 
—

 
(0.7
)
 
(0.6
)
 
0.4

Net periodic benefit cost (income) from continuing operations
$
0.3

 
$
2.6

 
$
(0.4
)
 
$
1.9

 
$
3.2

 
$
(4.8
)

 
Nine Months Ended September 30,
 
2016
 
2015
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
13.9

 
$
5.4

 
$
—

 
$
19.3

 
$
8.9

 
$
—

Interest cost
30.8

 
4.6

 
—

 
41.3

 
12.3

 
0.1

Expected return on plan assets
(43.0
)
 
(1.5
)
 
—

 
(52.8
)
 
(10.0
)
 
—

Amortization of prior service (credit) cost
(0.2
)
 
—

 
(1.7
)
 
0.2

 
—

 
(2.8
)
Amortization of net deferred actuarial loss
—

 
—

 
0.4

 
—

 
—

 
0.5

Curtailment gain
—

 
(0.9
)
 
—

 
—

 
—

 
(4.5
)
Net periodic benefit cost (income)
1.5

 
7.6

 
(1.3
)
 
8.0

 
11.2

 
(6.7
)
Less: discontinued operations
(0.5
)
 
(0.2
)
 
—

 
(2.2
)
 
(1.6
)
 
1.2

Net periodic benefit cost (income) from continuing operations
$
1.0

 
$
7.4

 
$
(1.3
)
 
$
5.8

 
$
9.6

 
$
(5.5
)