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Accumulated Other Comprehensive (Loss) (Tables)
6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Schedule of changes in Accumulated Other Comprehensive Loss
The changes in the components of Accumulated Other Comprehensive Loss attributable to GPHC for the six months ended June 30, 2020 are as follows:

In millions, net of taxDerivatives InstrumentsPension and Postretirement Benefit PlansCurrency Translation AdjustmentsTotal
Balance at December 31, 2019$(16.6) $(238.5) $(110.7) $(365.8) 
Other Comprehensive Income (Loss) before Reclassifications
4.1  32.0  (42.9) (6.8) 
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income(a)
(2.5) 123.5  —  121.0  
Net Current-period Other Comprehensive Income (Loss)
1.6  155.5  (42.9) 114.2  
Less:
Net Current-period Other Comprehensive (Income) Loss Attributable to Noncontrolling Interest(b)
(0.3) (41.9) 8.2  (34.0) 
Balance at June 30, 2020$(15.3) $(124.9) $(145.4) $(285.6) 
(a) See following table for details about these reclassifications.
(b) Includes amounts related to redeemable noncontrolling interest which are separately classified outside of permanent equity in the mezzanine section of the Condensed Consolidated Balance Sheets.
Reclassification out of Accumulated Other Comprehensive Loss
The following represents reclassifications out of Accumulated Other Comprehensive Loss for the six months ended June 30, 2020:

In millions
Details about Accumulated Other Comprehensive Loss ComponentsAmount Reclassified from Accumulated Other Comprehensive LossAffected Line Item in the Statement Where Net Income is Presented
Derivatives Instruments:
Commodity Contracts$(5.4) Cost of Sales
Foreign Currency Contracts(0.6) Other (Income) Expense, Net
Interest Rate Swap Agreements
2.9  Interest Expense, Net
(3.1) Total before Tax
0.6  Tax Expense
$(2.5) Net of Tax
Amortization of Defined Benefit Pension Plans:
Actuarial Losses155.2  
(a)
155.2  Total before Tax
(30.9) Tax Benefit
$124.3  Net of Tax
Amortization of Postretirement Benefit Plans:
Prior Service Credits$(0.1) 
(a)
Actuarial Gains(0.9) 
(a)
(1.0) Total before Tax
0.2  Tax Expense
$(0.8) Net of Tax
Total Reclassifications for the Period
$121.0  
(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see “Note 6 — Pensions and Other Postretirement Benefits").