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Pension Plans and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Pension and Other Postretirement Benefit Expense [Abstract]  
Net funded status of fully funded, underfunded, and unfunded pension plans
Pension Plans    The following table presents the funded status of Grace's fully-funded, underfunded, and unfunded pension plans:
(In millions)
June 30,
2014
 
December 31,
2013
Overfunded defined benefit pension plans
$
45.7

 
$
16.7

Underfunded defined benefit pension plans
(18.8
)
 
(66.2
)
Unfunded defined benefit pension plans(1)
(324.3
)
 
(233.4
)
Total underfunded and unfunded defined benefit pension plans
(343.1
)
 
(299.6
)
Unfunded defined benefit pension plans included in liabilities subject to compromise(1)
—

 
(123.6
)
Pension liabilities included in other current liabilities
(15.7
)
 
(15.0
)
Net funded status
$
(313.1
)
 
$
(421.5
)
Components of net periodic benefit cost (income)
Components of Net Periodic Benefit Cost (Income)
 
Three Months Ended June 30,
 
2014
 
2013
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
5.9

 
$
2.8

 
$
0.1

 
$
6.3

 
$
2.7

 
$
—

Interest cost
14.9

 
5.6

 
0.3

 
13.1

 
5.1

 
0.6

Expected return on plan assets
(17.5
)
 
(3.9
)
 
—

 
(17.0
)
 
(3.5
)
 
—

Amortization of prior service cost (credit)
0.2

 
—

 
(0.4
)
 
0.2

 
—

 
—

Amortization of net deferred actuarial (gain) loss
—

 
—

 
(0.1
)
 
—

 
—

 
0.1

Annual mark-to-market adjustment
—

 
—

 
—

 
—

 
—

 
—

Gain on termination of postretirement plans
—

 
—

 
(7.9
)
 
—

 
—

 
—

Net periodic benefit cost (income)
$
3.5

 
$
4.5

 
$
(8.0
)
 
$
2.6

 
$
4.3

 
$
0.7

 
Six Months Ended June 30,
 
2014
 
2013
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
11.8

 
$
5.5

 
$
0.1

 
$
12.6

 
$
5.4

 
$
0.1

Interest cost
30.1

 
11.3

 
0.9

 
26.0

 
10.2

 
1.1

Expected return on plan assets
(35.0
)
 
(7.8
)
 
—

 
(34.0
)
 
(7.0
)
 
—

Amortization of prior service cost (credit)
0.4

 
—

 
(0.5
)
 
0.4

 
—

 
—

Amortization of net deferred actuarial (gain) loss
—

 
—

 
(0.3
)
 
—

 
—

 
0.2

Annual mark-to-market adjustment
(3.1
)
 
—

 
—

 
—

 
—

 
—

Gain on termination of postretirement plans
—

 
—

 
(7.9
)
 
—

 
—

 
—

Net periodic benefit cost (income)
$
4.2

 
$
9.0

 
$
(7.7
)
 
$
5.0

 
$
8.6

 
$
1.4