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Pension Plans and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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,
2015
 
December 31,
2014
Overfunded defined benefit pension plans
$
45.6

 
$
44.1

Underfunded defined benefit pension plans
(81.3
)
 
(79.5
)
Unfunded defined benefit pension plans
(357.3
)
 
(378.0
)
Total underfunded and unfunded defined benefit pension plans
(438.6
)
 
(457.5
)
Pension liabilities included in other current liabilities
(15.1
)
 
(15.6
)
Net funded status
$
(408.1
)
 
$
(429.0
)
Components of net periodic benefit cost (income)
Components of Net Periodic Benefit Cost (Income)
 
Three Months Ended June 30,
 
2015
 
2014
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
6.5

 
$
2.9

 
$
—

 
$
5.9

 
$
2.8

 
$
0.1

Interest cost
13.8

 
4.0

 
—

 
14.9

 
5.6

 
0.3

Expected return on plan assets
(17.6
)
 
(3.3
)
 
—

 
(17.5
)
 
(3.9
)
 
—

Amortization of prior service (credit) cost
—

 
—

 
(0.9
)
 
0.2

 
—

 
(0.4
)
Amortization of net deferred actuarial loss (gain)
—

 
—

 
0.1

 
—

 
—

 
(0.1
)
Gain on termination of postretirement plans
—

 
—

 
—

 
—

 
—

 
(7.9
)
Net periodic benefit cost (income)
$
2.7

 
$
3.6

 
$
(0.8
)
 
$
3.5

 
$
4.5

 
$
(8.0
)
 
Six Months Ended June 30,
 
2015
 
2014
 
Pension
 
Other Post
Retirement
 
Pension
 
Other Post
Retirement
(In millions)
U.S.
 
Non-U.S.
 
 
U.S.
 
Non-U.S.
 
Service cost
$
12.9

 
$
5.9

 
$
—

 
$
11.8

 
$
5.5

 
$
0.1

Interest cost
27.6

 
8.2

 
0.1

 
30.1

 
11.3

 
0.9

Expected return on plan assets
(35.2
)
 
(6.7
)
 
—

 
(35.0
)
 
(7.8
)
 
—

Amortization of prior service cost (credit)
0.1

 
—

 
(1.9
)
 
0.4

 
—

 
(0.5
)
Amortization of net deferred actuarial loss (gain)
—

 
—

 
0.3

 
—

 
—

 
(0.3
)
Mark-to-market adjustment
—

 
—

 
—

 
(3.1
)
 
—

 
—

Gain on termination of postretirement plans
—

 
—

 
—

 
—

 
—

 
(7.9
)
Net periodic benefit cost (income)
$
5.4

 
$
7.4

 
$
(1.5
)
 
$
4.2

 
$
9.0

 
$
(7.7
)