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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Tabular disclosure of pre-tax, tax, and after-tax components of other comprehensive income (loss)
The following tables present the pre-tax, tax, and after-tax components of Grace's other comprehensive loss for the years ended December 31, 2015, 2014, and 2013:
Year Ended December 31, 2015
(In millions)
Pre-Tax Amount
 
Tax Benefit/ (Expense)
 
After-Tax Amount
Defined benefit pension and other postretirement plans:
 
 
 
 
 
Amortization of net prior service credit included in net periodic benefit cost
$
(3.1
)
 
$
1.0

 
$
(2.1
)
Amortization of net deferred actuarial loss included in net periodic benefit cost
0.7

 
(0.2
)
 
0.5

Net prior service credit arising during period
5.7

 
(1.9
)
 
3.8

Net deferred actuarial loss arising during period
(0.4
)
 
0.1

 
(0.3
)
Loss on curtailment of postretirement plans
(4.5
)
 
1.6

 
(2.9
)
Benefit plans, net
(1.6
)
 
0.6

 
(1.0
)
Currency translation adjustments
(43.3
)
 
—

 
(43.3
)
Gain from hedging activities
2.1

 
(0.8
)
 
1.3

Other comprehensive loss attributable to W. R. Grace & Co. shareholders
$
(42.8
)
 
$
(0.2
)
 
$
(43.0
)
Year Ended December 31, 2014
(In millions)
Pre-Tax Amount
 
Tax Benefit/ (Expense)
 
After-Tax Amount
Defined benefit pension and other postretirement plans:
 
 
 
 
 
Amortization of net prior service credit included in net periodic benefit cost
$
(1.7
)
 
$
0.6

 
$
(1.1
)
Net prior service credit arising during period
13.6

 
(4.8
)
 
8.8

Net deferred actuarial gain arising during period
1.0

 
(0.4
)
 
0.6

Loss on termination of postretirement plans
(12.2
)
 
1.3

 
(10.9
)
Benefit plans, net
0.7

 
(3.3
)
 
(2.6
)
Currency translation adjustments
(28.0
)
 
—

 
(28.0
)
Loss from hedging activities
(7.1
)
 
2.6

 
(4.5
)
Other than temporary impairment of investment
0.8

 
—

 
0.8

Loss on securities available for sale
(0.1
)
 
—

 
(0.1
)
Other comprehensive loss attributable to W. R. Grace & Co. shareholders
$
(33.7
)
 
$
(0.7
)
 
$
(34.4
)
Year Ended December 31, 2013
(In millions)
Pre-Tax Amount
 
Tax Benefit/ (Expense)
 
After-Tax Amount
Defined benefit pension and other postretirement plans:
 
 
 
 
 
Amortization of net prior service cost included in net periodic benefit cost
$
0.7

 
$
(0.2
)
 
$
0.5

Amortization of net deferred actuarial loss included in net periodic benefit cost
0.4

 
(0.1
)
 
0.3

Net prior service credit arising during period
1.7

 
(0.6
)
 
1.1

Net deferred actuarial gain arising during period
4.3

 
(1.6
)
 
2.7

Benefit plans, net
7.1

 
(2.5
)
 
4.6

Currency translation adjustments
(23.6
)
 
—

 
(23.6
)
Loss from hedging activities
(0.3
)
 
0.1

 
(0.2
)
Gain on securities available for sale
0.1

 
—

 
0.1

Other comprehensive loss attributable to W. R. Grace & Co. shareholders
$
(16.7
)
 
$
(2.4
)
 
$
(19.1
)
Schedule of components of accumulated other comprehensive loss
The following table presents the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2015, 2014, and 2013:
 
Defined Benefit Pension and Other Postretirement Plans
 
Currency Translation Adjustments
 
Gain (Loss) from Hedging Activities
 
Unrealized Loss on Investment
 
Gain (Loss) on Securities Available for Sale
 
Total
Balance, December 31, 2012
$
2.0

 
$
28.8

 
$
(0.3
)
 
$
(0.8
)
 
$
—

 
$
29.7

Other comprehensive income (loss) before reclassifications
3.8

 
(23.6
)
 
1.2

 
—

 
0.1

 
(18.5
)
Amounts reclassified from accumulated other comprehensive income
0.8

 
—

 
(1.4
)
 
—

 
—

 
(0.6
)
Net current-period other comprehensive income (loss)
4.6

 
(23.6
)
 
(0.2
)
 
—

 
0.1

 
(19.1
)
Balance, December 31, 2013
$
6.6

 
$
5.2

 
$
(0.5
)
 
$
(0.8
)
 
$
0.1

 
$
10.6

Other comprehensive income (loss) before reclassifications
9.4

 
(28.0
)
 
(3.2
)
 
—

 
(0.7
)
 
(22.5
)
Amounts reclassified from accumulated other comprehensive income
(12.0
)
 
—

 
(1.3
)
 
0.8

 
0.6

 
(11.9
)
Net current-period other comprehensive (loss) income
(2.6
)
 
(28.0
)
 
(4.5
)
 
0.8

 
(0.1
)
 
(34.4
)
Balance, December 31, 2014
$
4.0

 
$
(22.8
)
 
$
(5.0
)
 
$
—

 
$
—

 
$
(23.8
)
Other comprehensive income (loss) before reclassifications
3.5

 
(43.3
)
 
0.6

 
—

 
—

 
(39.2
)
Amounts reclassified from accumulated other comprehensive income
(4.5
)
 
—

 
0.7

 
—

 
—

 
(3.8
)
Net current-period other comprehensive (loss) income
(1.0
)
 
(43.3
)
 
1.3

 
—

 
—

 
(43.0
)
Balance, December 31, 2015
$
3.0

 
$
(66.1
)
 
$
(3.7
)
 
$
—

 
$
—

 
$
(66.8
)