Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 278.1	$ 294.0	$ 300.2
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities:
Depreciation and Amortization	447.2	430.6	330.3
Amortization of Deferred Debt Issuance Costs	4.7	4.4	5.1
Deferred Income Taxes	52.7	26.0	(54.0)
Amount of Postretirement Expense Greater (Less) Than Funding	41.5	(4.7)	(127.1)
Gain on the Sale of Assets, net	0.0	(38.6)	(3.7)
Other, Net	15.1	35.3	2.0
Changes in Operating Assets and Liabilities, Net of Acquisitions (See Note 3)	(173.5)	(1,120.8)	(645.3)
Net Cash Provided by (Used in) Operating Activities	665.8	(373.8)	(192.5)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital Spending	330.9	378.8	240.9
Packaging Machinery Spending	(22.0)	(16.4)	(19.2)
Acquisition of Businesses, Net of Cash Acquired	(54.5)	(89.4)	(189.4)
Proceeds Received from Sale of Assets, Net of Selling Costs	0.0	49.4	7.9
Beneficial Interest on Sold Receivables	343.6	1,476.7	806.1
Beneficial Interest Obtained in Exchange for Proceeds	(155.9)	(345.5)	(97.4)
Other, Net	(4.6)	(6.9)	1.0
Net Cash (Used in) Provided by Investing Activities	(224.3)	689.1	268.1
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchase of Common Stock	(128.8)	(119.1)	(62.1)
Payments on Debt	(36.5)	(152.4)	(25.0)
Proceeds from Issuance of Debt	300.0	0.0	0.0
Borrowings under Revolving Credit Facilities	2,497.5	1,876.9	1,202.9
Payments on Revolving Credit Facilities	(2,865.1)	(1,787.5)	(1,090.8)
Debt Issuance Costs	(5.0)	(7.9)	0.0
Repurchase of Common Stock related to Share-Based Payments	(4.1)	(4.3)	(10.2)
Dividends and Distributions Paid to GPIP Partner	(112.7)	(111.0)	(93.4)
Other, Net	(6.1)	(5.4)	8.8
Net Cash Used In Financing Activities	(360.8)	(310.7)	(69.8)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	1.7	(1.5)	2.5
Net Increase in Cash and Cash Equivalents	82.4	3.1	8.3
Cash and Cash Equivalents at Beginning of Year	70.5	67.4	59.1
CASH AND CASH EQUIVALENTS AT END OF YEAR	152.9	70.5	67.4
Non-cash Investing Activities:
Beneficial Interest (Sold) Obtained in Exchange for Trade Receivables	68.8
Beneficial Interest (Sold) Obtained in Exchange for Trade Receivables		1,025.7	734.7
Non-cash Investment in NACP Combination	0.0	1,111.2	0.0
Non-cash Investing Activities	(68.8)	2,136.9	734.7
Non-cash Financing Activities:
Non-cash Financing of NACP Combination	0.0	660.0	0.0
Non-Cash Financing Activities	$ 0.0	$ 660.0	$ 0.0