v3.26.1
Segment Information - Additional Information (Details)
3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]
Number Of Reportable Segments Not Disclosed Flag
reportable segments
X
- Definition
NumberOfReportableSegmentsNotDisclosedFlag
+ References
No definition available.
+ Details
Name:
gpk_NumberOfReportableSegmentsNotDisclosedFlag
Namespace Prefix:
gpk_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- References
No definition available.
+ Details
Name:
us-gaap_SegmentReportingAbstract
Namespace Prefix:
us-gaap_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration