Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net Sales	$ 1,611.0	$ 1,552.8	$ 3,210.1	$ 3,058.7
Cost of Sales	1,348.9	1,265.0	2,627.2	2,504.8
Selling, General and Administrative	132.2	131.8	267.8	256.5
Other (Income) Expense, Net	(5.4)	1.7	1.1	2.9
Business Combinations and Shutdown and Other Special Charges, Net	20.5	9.9	39.2	16.1
Income from Operations	114.8	144.4	274.8	278.4
Nonoperating Pension and Postretirement Benefit Income (Expense)	0.6	0.0	(151.0)	(0.1)
Interest Expense, Net	(30.7)	(35.5)	(64.4)	(70.5)
Income before Income Taxes and Equity Income of Unconsolidated Entity	84.7	108.9	59.4	207.8
Income Tax Expense	(18.3)	(23.0)	(12.9)	(44.0)
Income before Equity Income of Unconsolidated Entity	66.4	85.9	46.5	163.8
Equity Income of Unconsolidated Entity	0.3	0.2	0.4	0.4
Net Income	66.7	86.1	46.9	164.2
Net Income Attributable to Noncontrolling Interest	(14.6)	(22.3)	(7.5)	(42.5)
Net Income Attributable to Graphic Packaging Holding Company	$ 52.1	$ 63.8	$ 39.4	$ 121.7
Net Income Per Share Attributable to Graphic Packaging Holding Company — Basic (in dollars per share)	$ 0.19	$ 0.22	$ 0.14	$ 0.41
Net Income Per Share Attributable to Graphic Packaging Holding Company — Diluted (in dollars per share)	$ 0.19	$ 0.22	$ 0.14	$ 0.41