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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
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 income (loss) for the three and six months ended June 30, 2018 and 2017:
Three Months Ended June 30, 2018
(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
$
(0.4
)
 
$
0.1

 
$
(0.3
)
Amortization of net deferred actuarial loss included in net periodic benefit cost
0.1

 
—

 
0.1

Benefit plans, net
(0.3
)
 
0.1

 
(0.2
)
Currency translation adjustments
40.6

 
(2.7
)
 
37.9

Gain (loss) from hedging activities
(8.2
)
 
3.0

 
(5.2
)
Other comprehensive income (loss) attributable to W. R. Grace & Co. shareholders
$
32.1

 
$
0.4

 
$
32.5


Six Months Ended June 30, 2018
(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
$
(0.8
)
 
$
0.2

 
$
(0.6
)
Amortization of net deferred actuarial loss included in net periodic benefit cost
0.2

 
—

 
0.2

Benefit plans, net
(0.6
)
 
0.2

 
(0.4
)
Currency translation adjustments
19.8

 
(0.1
)
 
19.7

Gain (loss) from hedging activities
(5.6
)
 
2.2

 
(3.4
)
Other comprehensive income (loss) attributable to W. R. Grace & Co. shareholders
$
13.6

 
$
2.3

 
$
15.9

Three Months Ended June 30, 2017
(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
$
(0.6
)
 
$
0.2

 
$
(0.4
)
Amortization of net deferred actuarial loss included in net periodic benefit cost
0.1

 
(0.1
)
 
—

Benefit plans, net
(0.5
)
 
0.1

 
(0.4
)
Currency translation adjustments
(8.3
)
 
—

 
(8.3
)
Gain (loss) from hedging activities
(0.2
)
 
—

 
(0.2
)
Other comprehensive income (loss) attributable to W. R. Grace & Co. shareholders
$
(9.0
)
 
$
0.1

 
$
(8.9
)
Six Months Ended June 30, 2017
(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
$
(1.2
)
 
$
0.4

 
$
(0.8
)
Amortization of net deferred actuarial loss included in net periodic benefit cost
0.2

 
(0.1
)
 
0.1

Benefit plans, net
(1.0
)
 
0.3

 
(0.7
)
Currency translation adjustments
(9.7
)
 
—

 
(9.7
)
Gain (loss) from hedging activities
0.7

 
(0.2
)
 
0.5

Other comprehensive income (loss) attributable to W. R. Grace & Co. shareholders
$
(10.0
)
 
$
0.1

 
$
(9.9
)
Schedule of components of accumulated other comprehensive loss
The following tables present the changes in accumulated other comprehensive income (loss), net of tax, for the six months ended June 30, 2018 and 2017:
Six Months Ended June 30, 2018
(In millions)
Defined Benefit Pension and Other Postretirement Plans
 
Currency Translation Adjustments
 
Gain (Loss) from Hedging Activities
 
Total
Beginning balance
$
0.9

 
$
41.6

 
$
(2.6
)
 
$
39.9

Other comprehensive income (loss) before reclassifications
—

 
19.7

 
20.0

 
39.7

Amounts reclassified from accumulated other comprehensive income (loss)
(0.4
)
 
—

 
(23.4
)
 
(23.8
)
Net current-period other comprehensive income (loss)
(0.4
)
 
19.7

 
(3.4
)
 
15.9

Ending balance
$
0.5

 
$
61.3

 
$
(6.0
)
 
$
55.8

Six Months Ended June 30, 2017
(In millions)
Defined Benefit Pension and Other Postretirement Plans
 
Currency Translation Adjustments
 
Gain (Loss) from Hedging Activities
 
Total
Beginning balance
$
2.2

 
$
67.6

 
$
(3.4
)
 
$
66.4

Other comprehensive income (loss) before reclassifications
—

 
(9.7
)
 
(0.7
)
 
(10.4
)
Amounts reclassified from accumulated other comprehensive income (loss)
(0.7
)
 
—

 
1.2

 
0.5

Net current-period other comprehensive income (loss)
(0.7
)
 
(9.7
)
 
0.5

 
(9.9
)
Ending balance
$
1.5

 
$
57.9

 
$
(2.9
)
 
$
56.5