WestRock (WRK) 10-Q 3 May 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	Apr. 19, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	WRK
Entity Registrant Name	WestRock CO
Entity Central Index Key	0001732845
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		257,042,757

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 4,620	$ 4,017		$ 8,947.4	$ 7,911
Cost of goods sold	3,720.4	3,227.6		7,266	6,348.1
Selling, general and administrative, excluding intangible amortization	444.1	395.8		845	776.6
Selling, general and administrative intangible amortization	102.4	75.2		195.3	147.7
Loss (gain) on disposal of assets		2.8		(43.8)	3.9
Multiemployer pension withdrawals					180
Land and Development impairments	13		$ 27.6	13	27.6
Restructuring and other costs	34.8	31.7		89.2	48
Operating profit (loss)	305.3	283.9		582.7	379.1
Interest expense, net	(111.8)	(78.3)		(206.2)	(143.1)
Gain (loss) on extinguishment of debt	0.4	0.1		(1.5)	(0.9)
Pension and other postretirement non-service income	18.7	24.6		36	49.2
Other (expense) income, net	(3.3)	1.1		(6)	3.6
Equity in (loss) income of unconsolidated entities	(0.2)	11.9		6.6	15.7
Income before income taxes	209.1	243.3		411.6	303.6
Income tax (expense) benefit	(47.2)	(18.8)		(109.9)	1,054.4
Consolidated net income	161.9	224.5		301.7	1,358
Less: Net (income) loss attributable to noncontrolling interests	(1.5)	(1.3)		(2.2)	0.3
Net income attributable to common stockholders	$ 160.4	$ 223.2		$ 299.5	$ 1,358.3
Basic earnings per share attributable to common stockholders	$ 0.63	$ 0.87		$ 1.17	$ 5.32
Diluted earnings per share attributable to common stockholders	$ 0.62	$ 0.86		$ 1.15	$ 5.23
Basic weighted average shares outstanding	256.6	256.1		255.7	255.5
Diluted weighted average shares outstanding	259.4	260.3		259.4	259.7
Cash dividends paid per common share	$ 0.455	$ 0.43		$ 0.91	$ 0.86

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income	$ 161.9	$ 224.5	$ 301.7	$ 1,358
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	25.2	54.2	(39.7)	12.3
Derivatives:
Deferred gain on cash flow hedges		0.1
Reclassification adjustment of net loss on cash flow hedges included in earnings				0.5
Unrealized gain on available for sale security				0.8
Reclassification adjustment of gain on available for sale security included in earnings		(1.5)		(1.5)
Defined benefit pension and other postretirement benefit plans:
Amortization and settlement recognition of net actuarial loss, included in pension cost	3.2	3.3	8.1	6.6
Prior service cost arising during the period				(2.7)
Amortization and settlement recognition of prior service cost, included in pension cost	0.4		0.9
Other comprehensive income (loss), net of tax	28.8	56.1	(30.7)	16
Comprehensive income	190.7	280.6	271	1,374
Less: Comprehensive income attributable to noncontrolling interests	(1)	(1.5)	(1.7)	(0.1)
Comprehensive income attributable to common stockholders	$ 189.7	$ 279.1	$ 269.3	$ 1,373.9

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions		Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents		$ 154.2	$ 636.8
Accounts receivable (net of allowances of $46.9 and $49.7)		2,367	2,010.7
Inventories		2,096.9	1,829.6
Other current assets		562.4	248.5
Assets held for sale		33.5	59.5
Total current assets		5,214	4,785.1
Property, plant and equipment, net		11,029.4	9,082.5
Goodwill		7,300.9	5,577.6
Intangibles, net		4,277.9	3,122
Restricted assets held by special purpose entities		1,277.7	1,281
Prepaid pension asset		447.7	420
Other assets		1,145.4	1,092.3
Total Assets		30,693	25,360.5
Current liabilities:
Current portion of debt		1,422.4	740.7
Accounts payable		1,702	1,716.8
Accrued compensation and benefits		380.6	399.3
Other current liabilities		541.6	476.5
Total current liabilities		4,046.6	3,333.3
Long-term debt due after one year		9,373.1	5,674.5
Pension liabilities, net of current portion		251	261.3
Postretirement benefit liabilities, net of current portion		141.5	134.8
Non-recourse liabilities held by special purpose entities		1,149.5	1,153.7
Deferred income taxes		2,955.2	2,321.5
Other long-term liabilities		1,119.3	994.8
Commitments and contingencies (Note 14)
Redeemable noncontrolling interests		3.2	4.2
Equity:
Preferred stock, $0.01 par value; 30.0 million shares authorized; no shares outstanding		0	0
Common Stock, $0.01 par value; 600.0 million shares authorized; 256.9 million and 253.5 million shares outstanding at March 31, 2019 and September 30, 2018, respectively		2.6	2.5
Capital in excess of par value		10,692.5	10,588.9
Retained earnings		1,671.2	1,573.3
Accumulated other comprehensive loss	[1]	(725.5)	(695.3)
Total stockholders’ equity		11,640.8	11,469.4
Noncontrolling interests		12.8	13
Total equity		11,653.6	11,482.4
Total Liabilities and Equity		$ 30,693	$ 25,360.5
[1]	All amounts are net of tax and noncontrolling interests.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Statement Of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 46.9	$ 49.7
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	30,000,000	30,000,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	600,000,000	600,000,000
Common Stock, Shares, Outstanding	256,900,000	253,500,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions		Total		Common Stock [Member]		Capital in Excess of Par Value [Member]		Retained Earnings [Member]	AOCI Attributable to Parent	Noncontrolling Interests [Member]
Beginning balance at Sep. 30, 2017				254,500,000
Shares issued under restricted stock plan				700,000
Issuance of common stock, net of stock received for minimum tax withholdings	[1]			1,200,000
Purchases of common stock		0
Ending balance at Mar. 31, 2018				256,400,000
Beginning balance at Sep. 30, 2017				$ 2.5		$ 10,624.9		$ 172.4	$ (457.3)	$ 43.6	[2]
Net income (loss)		$ 0.3
Distributions and adjustments to noncontrolling interests	[2]									(9.3)
Net income attributable to common stockholders								1,358.3
Dividends declared (per share - $0.455, $0.43, $0.91 and $0.86)	[3]							(221.9)
Compensation expense under share-based plans						33.7
Issuance of common stock, net of stock received for minimum tax withholdings				0.1	[1]	26	[1]	(6.4)
Other comprehensive loss, net of tax		15.6	[4]						15.6
Ending balance at Mar. 31, 2018		11,582.2		$ 2.6		10,684.6		1,302.4	(441.7)	34.3	[2]
Total Stockholders’ equity at Mar. 31, 2018		11,547.9
Beginning balance at Dec. 31, 2017				254,900,000
Shares issued under restricted stock plan				700,000
Issuance of common stock, net of stock received for minimum tax withholdings	[1]			800,000
Ending balance at Mar. 31, 2018				256,400,000
Beginning balance at Dec. 31, 2017				$ 2.5		10,651.7		1,196.8	(497.6)	40.2	[2]
Net income (loss)		(1.3)								1.1	[2]
Distributions and adjustments to noncontrolling interests	[2]									(7)
Net income attributable to common stockholders								223.2
Dividends declared (per share - $0.455, $0.43, $0.91 and $0.86)	[3]							(111.2)
Compensation expense under share-based plans						19.4
Issuance of common stock, net of stock received for minimum tax withholdings				0.1	[1]	13.5	[1]	(6.4)
Other comprehensive loss, net of tax									55.9
Ending balance at Mar. 31, 2018		11,582.2		$ 2.6		10,684.6		1,302.4	(441.7)	34.3	[2]
Total Stockholders’ equity at Mar. 31, 2018		$ 11,547.9
Beginning balance at Sep. 30, 2018		253,500,000		253,500,000
Shares issued under restricted stock plan				3,000,000
Issuance of common stock, net of stock received for minimum tax withholdings	[1]			2,500,000
Purchases of common stock		(2,100,000)		(2,100,000)
Ending balance at Mar. 31, 2019		256,900,000		256,900,000
Beginning balance at Sep. 30, 2018		$ 11,482.4		$ 2.5		10,588.9		1,573.3	(695.3)	13	[2]
Net income (loss)		(2.2)								1.4	[2]
Contributions	[2]									0.2
Distributions and adjustments to noncontrolling interests	[2]									(1.8)
Adoption of revenue from contracts with customers standard								43.5
Net income attributable to common stockholders								299.5
Dividends declared (per share - $0.455, $0.43, $0.91 and $0.86)	[3]							(242.3)
Compensation expense under share-based plans						36.1
Issuance of common stock, net of stock received for minimum tax withholdings				0.1	[1]	82.9	[1]	(0.4)
Fair value of share-based awards issued in business combinations						70.8
Other comprehensive loss, net of tax		(30.2)	[4]						(30.2)
Purchases of common stock						(86.2)		(2.4)
Ending balance at Mar. 31, 2019		11,653.6		$ 2.6		10,692.5		1,671.2	(725.5)	12.8	[2]
Total Stockholders’ equity at Mar. 31, 2019		$ 11,640.8
Beginning balance at Dec. 31, 2018				255,200,000
Shares issued under restricted stock plan				2,700,000
Issuance of common stock, net of stock received for minimum tax withholdings	[1]			100,000
Purchases of common stock				(1,100,000)
Ending balance at Mar. 31, 2019		256,900,000		256,900,000
Beginning balance at Dec. 31, 2018				$ 2.6		10,720.6		1,635.3	(754.8)	11.8	[2]
Net income (loss)		$ (1.5)								1.1	[2]
Distributions and adjustments to noncontrolling interests	[2]									(0.1)
Net income attributable to common stockholders								160.4
Dividends declared (per share - $0.455, $0.43, $0.91 and $0.86)	[3]							(124.5)
Compensation expense under share-based plans						18.2
Issuance of common stock, net of stock received for minimum tax withholdings	[1]					(1.9)
Other comprehensive loss, net of tax									29.3
Purchases of common stock						(44.4)
Ending balance at Mar. 31, 2019		11,653.6		$ 2.6		$ 10,692.5		$ 1,671.2	$ (725.5)	$ 12.8	[2]
Total Stockholders’ equity at Mar. 31, 2019		$ 11,640.8
[1]	Included in the issuance of common stock in the six months ended March 31, 2019 is the issuance of approximately 1.6 million shares of Common Stock (as hereinafter defined) valued at $70.1 million in connection with the KapStone Acquisition (as hereinafter defined).
[2]	Excludes amounts related to contingently redeemable noncontrolling interests, which are separately classified outside of permanent equity on the Condensed Consolidated Balance Sheets.
[3]	Includes cash dividends paid, dividend equivalent units on certain restricted stock awards and dividends declared but unpaid related to the shares reserved but unissued at the time of the acquisition for the resolution of Smurfit-Stone Container Corporation (“Smurfit-Stone”) bankruptcy claims.
[4]	All amounts are net of tax and noncontrolling interests.

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) shares in Millions, $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)$ / sharesshares
Cash dividends paid per share | $ / shares	$ 0.91
KapStone [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	1.6
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $	$ 70.1

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Consolidated net income	$ 301.7	$ 1,358
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation, depletion and amortization	742.8	622.5
Cost of real estate sold	11	27.1
Deferred income tax expense (benefit)	39.6	(1,222.7)
Share-based compensation expense	35.5	33.9
Pension and other postretirement funding (more) than expense (income)	(27)	(49.8)
Multiemployer pension withdrawals		180
Land and Development impairments	13	27.6
Other impairment adjustments	10	10.4
Gain on disposal of plant and equipment and other, net	(45.5)	(0.8)
Other	(46.3)	(15.6)
Change in operating assets and liabilities, net of acquisitions and divestitures:
Accounts receivable	117.3	(297.5)
Inventories	(67.5)	(83)
Other assets	(128.9)	(56)
Accounts payable	(143.4)	(67.3)
Income taxes	(27)	94.1
Accrued liabilities and other	(120.3)	(87.2)
Net cash provided by operating activities	665	473.7
Investing activities:
Capital expenditures	(625.4)	(426.7)
Cash paid related to business combinations, net of cash acquired	(3,349.3)	(185.2)
Cash receipts on sold trade receivables		253.1
Investment in unconsolidated entities	(0.2)	(111)
Proceeds from sale of property, plant and equipment	105.3	15.7
Proceeds from property, plant and equipment insurance settlement	8.8	4.8
Other	10.2	8.2
Net cash used for investing activities	(3,850.6)	(441.1)
Financing activities:
Proceeds from issuance of notes	1,498.5	1,197.3
Additions to revolving credit facilities	172	94.3
Additions to debt	3,957.9	853.2
Repayments of debt	(3,209.6)	(2,010.4)
Changes in commercial paper, net	588.3	63.3
Other financing additions (repayments), net	16.6	(24.5)
Issuances of common stock, net of related minimum tax withholdings	3.2	17.4
Purchases of common stock	(88.6)
Cash dividends paid to stockholders	(233.7)	(219.4)
Cash distributions paid to noncontrolling interests	(2.8)	(8.6)
Other	3	(24.9)
Net cash provided by (used for) financing activities	2,704.8	(62.3)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1.8)	(1.9)
Decrease in cash, cash equivalents and restricted cash	(482.6)	(31.6)
Cash, cash equivalents and restricted cash at beginning of period	636.8	304
Cash, cash equivalents and restricted cash at end of period	154.2	272.4
Supplemental disclosure of cash flow information:
Income taxes, net of refunds	94.3	69.8
Interest, net of amounts capitalized	$ 202.9	$ 135.1

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions	6 Months Ended
	Mar. 31, 2018USD ($)
Non-cash investing activities:
Deferred purchase price of trade receivables sold	$ 250

CONDENSED CONSOLIDATED STATEM_7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical 1) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Statement Of Cash Flows [Abstract]
Fair value of assets acquired, including goodwill	$ 5,912.4	$ 228
Cash consideration for the purchase of businesses, net of cash acquired	(3,350.2)	(187.4)
Stock issued for the purchase of a business	(70.1)
Fair value of share-based awards issued in the purchase of a business	(70.8)
Deferred payments and unpaid working capital	16.6	(26.3)
Liabilities assumed	$ 2,437.9	$ 14.3

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Note 1. Basis of Presentation and Significant Accounting Policies Basis of Presentation Our independent registered public accounting firm has not audited our accompanying interim financial statements. We derived the Condensed Consolidated Balance Sheet at September 30, 2018 from the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018 (the “ Fiscal 2018 Form 10-K On October 1, 2018, we adopted Accounting Standards Update (“ ASU ASC Revenue from Contracts with Customers ASC 606 Note 2. Revenue Recognition We adopted ASU 2017-07, “ Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ” on October 1, 2018 on a retrospective basis. pon the adoption of this ASU, $24.6 million and $49.2 million, respectively, , which was previously reported in “Cost of goods sold” for $10.0 million and $20.0 million, respectively, and “S We adopted the provisions of ASU 2016-15 “ Classification of Certain Cash Receipts and Cash Payments We adopted the provisions of ASU 2016-18, “ Restricted Cash amounts shown on the condensed consolidated statements of cash flows. Due to the minimal amount of restricted cash on our condensed consolidated balance sheets, the impact was not material. We have condensed or omitted certain notes and other information from the interim financial statements presented in this report. Therefore, these interim financial statements should be read in conjunction with our Fiscal 2018 Form 10-K. The results for the three and six months ended March 31, 2019 are not necessarily indicative of results that may be expected for the full year. Significant Accounting Policies See “ Note 1. Description of Business and Summary of Significant Accounting Policies Recent Accounting Developments New Accounting Standards - Recently Adopted See “ Note 1. Description of Business and Summary of Significant Accounting Policies — New Accounting Standards - Recently Adopted New Accounting Standards - Recently Issued See “ Note 1. Description of Business and Summary of Significant Accounting Policies — New Accounting Standards - Recently Issued In October 2018, the Financial Accounting Standards Board (“ FASB Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606 Collaborative arrangements ASC 808 In October 2018, the FASB issued ASU 2018-17 “ Consolidation: Targeted Improvements to Related Party Guidance for Variable Interest Entities GAAP In August 2018, the FASB issued ASU 2018-15 “ Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the FASB issued ASU 2018-14 “ Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans In February 2018, the FASB issued ASU 2018-02, “ Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income U.S. Tax Act Income Statement – Reporting Comprehensive Income” In August 2017, the FASB issued ASU 2017-12, “ Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities In October 2018, the FASB issued ASU 2018-16 “Derivatives and Hedging: Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting ”, which adds the overnight index rate based on the Secured Overnight Financing Rate to the list of U.S. benchmark interest rates in ASC 815 that are eligible to be hedged. In February 2016, the FASB issued ASU 2016-02 “ Leases”, Leases” Leases In December 2018, the FASB issued ASU 2018-20 “ Leases: Narrow-scope Improvements for Lessors ” to help lessors apply ASC 842, which allows lessors to make an accounting policy election not to evaluate sales taxes and other similar taxes collected from lessees, requires lessors to exclude from variable payments certain lessor costs paid directly by lessee to third parties on the lessor’s behalf and provides clarification on variable payments allocated to lease and non-lease components. “Leases (Topic 842): Codification Improvements” “Financial Services—Depository and Lending”

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue Recognition	Note 2. Revenue Recognition We adopted ASC 606 and all related amendments on October 1, 2018 using the modified retrospective method. We recorded the transition adjustment to the opening balance of retained earnings to account for the cumulative effect of adopting ASC 606. Since we used the modified retrospective method, we have not restated comparative information, which continues to be reported under the accounting standard in effect for those periods. We manufacture certain customized products that have no alternative use to us (since they are made to specific customer orders), and we believe that for certain customers we have a legally enforceable right to payment for performance completed to date on these products, including a reasonable profit. For manufactured products that meet these two criteria, we now recognize revenue “over time”. This results in revenue recognition prior to the date of shipment or title transfer for these products and increases the contract asset (unbilled receivables) balance with a corresponding reduction in finished goods inventory on our balance sheet. Due to the recurring nature of our sales of these customized products, the impact of ASC 606 is not expected to have a material impact on our condensed consolidated financial statements in future periods. The transition adjustment resulted in revenue acceleration of $183.7 million with a corresponding acceleration of cost of $133.4 million. The net increase to opening balance of retained earnings was $43.5 million (net of tax expense of $6.8 million) as of October 1, 2018 due to the cumulative impact of adopting the new revenue standard. The adoption of ASC 606 had the following impact on our condensed consolidated financial statements: Condensed Consolidated Statements of Income Three Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Net sales $ 4,620.0 $ 4,614.6 $ 5.4 Cost of goods sold $ 3,720.4 $ 3,715.5 $ 4.9 Income tax expense $ (47.2 ) $ (47.1 ) $ (0.1 ) Consolidated net income $ 161.9 $ 161.5 $ 0.4 Six Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Net sales $ 8,947.4 $ 8,950.1 $ (2.7 ) Cost of goods sold $ 7,266.0 $ 7,270.1 $ (4.1 ) Income tax expense $ (109.9 ) $ (109.6 ) $ (0.3 ) Consolidated net income $ 301.7 $ 300.6 $ 1.1 Condensed Consolidated Balance Sheet March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Inventories $ 2,096.9 $ 2,237.9 $ (141.0 ) Other current assets $ 562.4 $ 368.4 $ 194.0 Other current liabilities $ 541.6 $ 541.3 $ 0.3 Retained earnings $ 1,671.2 $ 1,626.6 $ 44.6 Condensed Consolidated Statement of Cash Flows Six Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Consolidated net income $ 301.7 $ 300.6 $ 1.1 Other assets $ (128.9 ) $ (131.6 ) $ 2.7 Inventories $ (67.5 ) $ (63.4 ) $ (4.1 ) Income taxes $ (27.0 ) $ (27.3 ) $ 0.3 Disaggregated Revenue ASC 606 requires that we disaggregate revenue from contracts with customers into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The tables below disaggregate our revenue by geographical market and product type (segment). Three Months Ended March 31, 2019 (In millions) Corrugated Packaging Consumer Packaging Land and Development Intersegment Sales Total Primary Geographical Markets North America $ 2,865.3 $ 1,308.3 $ 0.8 $ (39.8 ) $ 4,134.6 South America 109.6 17.9 — — 127.5 Europe — 269.6 — — 269.6 Asia Pacific 15.8 72.5 — — 88.3 Total (1) $ 2,990.7 $ 1,668.3 $ 0.8 $ (39.8 ) $ 4,620.0 (1) Net sales are attributed to geographical markets based on the location of the seller. Six Months Ended March 31, 2019 (In millions) Corrugated Packaging Consumer Packaging Land and Development Intersegment Sales Total Primary Geographical Markets North America $ 5,471.7 $ 2,564.7 $ 14.7 $ (77.7 ) $ 7,973.4 South America 218.4 37.4 — — 255.8 Europe — 530.1 — — 530.1 Asia Pacific 34.4 154.9 — (1.2 ) 188.1 Total (1) $ 5,724.5 $ 3,287.1 $ 14.7 $ (78.9 ) $ 8,947.4 (1) Net sales are attributed to geographical markets based on the location of the seller. Revenue Contract Balances Contract assets are rights to consideration in exchange for goods that we have transferred to a customer when that right is conditional on something other than the passage of time. Contract assets are reduced when title and risk of loss passes to the customer. Contract liabilities represent obligations to transfer goods or services to a customer for which we have received consideration. Contract liabilities are reduced once control of the goods is transferred to the customer. The opening and closing balances of our contract assets and contract liabilities are as follows. Contract assets and contract liabilities are aggregated within Other current assets and Other current liabilities, respectively, on the condensed consolidated balance sheet. (In millions) Contract Assets (Short-Term) Contract Liabilities (Short-Term) Beginning balance - October 1, 2018 $ 183.7 $ 7.9 Impact of acquisition 13.0 — Ending balance - March 31, 2019 194.0 12.4 (Decrease) / increase $ (2.7 ) $ 4.5 Performance Obligations and Significant Judgments We primarily derive revenue from fixed consideration. Certain contracts may also include variable consideration, typically in the form of cash discounts and volume rebates. If a contract with a customer includes variable consideration, we estimate the expected cash discounts and other customer refunds based on historical experience. We concluded this method is consistent with the most likely amount method under ASC 606 and allows us to make the best estimate of the consideration we will be entitled to from customers. Contracts or purchase orders with customers could include a single type of product or multiple types/grades of products. Regardless, the contract price with the customer is agreed to at the individual product level outlined in the customer contracts or purchase orders. Management has concluded that the prices negotiated with each individual customer are representative of the stand-alone selling price of the product. Practical Expedients and Exemptions As permitted by ASC 606, we elected to use certain practical expedients. We treat shipping and handling activities as fulfillment activities. We treat costs associated with obtaining new contracts as expenses when incurred if the amortization period of the asset we would recognize is one year or less. We do not record interest income when the difference in timing of control transfer and customer payment is one year or less. The election of these practical expedients results in accounting treatments that we believe are consistent with our historical accounting policies and, therefore, these elections and expedients do not have a material impact on comparability of our financial statements.

Acquisitions

Acquisitions	6 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	Note 3. Acquisitions We account for acquisitions in accordance with ASC 805, “ Business Combinations Note 2. Mergers, Acquisitions and Investment KapStone Acquisition On November 2, 2018, pursuant to the Agreement and Plan of Merger (the “ Merger Agreement KapStone WestRock Merger KapStone Merger KapStone Acquisition Effective Time KapStone is a leading North American producer and distributor of containerboard, corrugated products and specialty papers, including liner and medium containerboard, kraft papers and saturating kraft. KapStone also owns Victory Packaging, a packaging solutions distribution company with facilities in the U.S., Canada and Mexico. We have included the financial results of KapStone in our Corrugated Packaging segment since the date of the acquisition. Pursuant to the KapStone Acquisition, at the Effective Time, (a) each issued and outstanding share of common stock, par value $0.01 per share, of WRKCo (“ WRKCo common stock Company common stock KapStone common stock $35.00 per share Cash Consideration 0.4981 Stock Consideration 25% Maximum Stock Amount The consideration for the KapStone Acquisition was $4.9 billion including debt assumed, a long-term financing obligation and equity awards replaced with WestRock equity awards with identical terms. As a result, KapStone stockholders received in the aggregate approximately $3.3 billion in cash and WestRock common stock with a value of $70.1 million, or approximately 0.6% of the issued and outstanding shares of WestRock common stock immediately following the Effective Time. Pursuant to the Merger Agreement, at the Effective Time, the Company assumed any outstanding awards granted under the equity-based incentive plans of WRKCo and KapStone (including the shares underlying such awards), the award agreements evidencing the grants of such awards and, in the case of the WRKCo equity-based incentive plans, the remaining shares available for issuance under the applicable plan, in each case subject to adjustments to such awards in the manner set forth in the Merger Agreement. The following table summarizes the fair values of the assets acquired and liabilities assumed by major class of assets and liabilities as of the acquisition date, as well as adjustments made during fiscal 2019 (referred to as “measurement period adjustments”) (in millions): Amounts Recognized as of the Acquisition Date Measurement Period Adjustments (1) Amounts Recognized as of Acquisition Date (as Adjusted) (2) Cash and cash equivalents $ 8.6 $ — $ 8.6 Current assets, excluding cash and cash equivalents 878.9 (22.0 ) 856.9 Property, plant and equipment, net 1,910.3 12.7 1,923.0 Goodwill 1,755.0 (23.1 ) 1,731.9 Intangible assets 1,336.1 25.3 1,361.4 Other long-term assets 27.9 0.2 28.1 Total assets acquired 5,916.8 (6.9 ) 5,909.9 Current portion of debt 33.3 — 33.3 Current liabilities 337.5 2.3 339.8 Long-term debt due after one year 1,333.4 — 1,333.4 Accrued pension and other long-term benefits 9.8 1.5 11.3 Deferred income taxes 609.7 (13.6 ) 596.1 Other long-term liabilities 118.4 2.9 121.3 Total liabilities assumed 2,442.1 (6.9 ) 2,435.2 Net assets acquired $ 3,474.7 $ — $ 3,474.7 (1) The measurement period adjustments recorded in fiscal 2019 did not have a significant impact on our condensed consolidated statements of income for the three and six months ended March 31, 2019. (2) The measurement period adjustments were primarily due to refinements to third party appraisals and carrying amounts of certain assets and liabilities, as well as adjustments to certain tax accounts based on, among other things, adjustments to deferred tax liabilities. The net impact of the measurement period adjustments resulted in a net decrease to goodwill. We are in the process of analyzing the estimated values of all assets acquired and liabilities assumed including, among other things, finalizing third-party valuations of certain tangible and intangible assets, as well as the fair value of certain contracts and the determination of certain tax balances; therefore, the allocation of the purchase price is preliminary and subject to material revision. The fair value assigned to goodwill is primarily attributable to buyer-specific synergies expected to arise after the acquisition (e.g., enhanced geographic reach of the combined organization, increased vertical integration and other synergistic opportunities) and the assembled work force of KapStone, as well as from establishing deferred tax liabilities for the assets and liabilities acquired. The goodwill and intangibles resulting from the acquisition will not be amortizable for tax purposes. The following table summarizes the weighted average life and the fair value of intangible assets recognized in the KapStone Acquisition, excluding goodwill (in millions): Weighted Avg. Life Gross Carrying Amount Customer relationships 11.6 $ 1,297.0 Trademarks and tradenames 17.0 55.2 Favorable contracts 5.9 9.2 Total 11.8 $ 1,361.4 None of the intangible assets have significant residual value. The intangible assets are expected to be amortized over estimated useful lives ranging from one to 20 years based on the approximate pattern in which the economic benefits are consumed or straight-line if the pattern was not reliably determinable.

Restructuring and Other Costs

Restructuring and Other Costs	6 Months Ended
	Mar. 31, 2019
Restructuring And Other Costs [Abstract]
Restructuring and Other Costs	Note 4. Summary of Restructuring and Other Initiatives We recorded pre-tax restructuring and other costs of $34.8 million and $89.2 million for the three and six months ended March 31, 2019, respectively, and $31.7 million and $48.0 million for the three and six months ended March 31, 2018, respectively. These amounts are not comparable since the timing and scope of the individual actions associated with a given restructuring, acquisition, divestiture or integration can vary. We present our restructuring and other costs in more detail below. The following table summarizes our Restructuring and other costs (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Restructuring $ 24.3 $ 21.2 $ 50.0 $ 25.6 Other 10.5 10.5 39.2 22.4 Restructuring and other costs $ 34.8 $ 31.7 $ 89.2 $ 48.0 Restructuring Our restructuring charges are primarily associated with plant closures and employee costs due to merger and acquisition-related workforce reductions. When we close a facility, if necessary, we recognize a write-down to reduce the carrying value of equipment or other property to their estimated fair value less cost to sell and record charges for severance and other employee-related costs. Any subsequent change in fair value less cost to sell prior to disposition is recognized as it is identified; however, no gain is recognized in excess of the cumulative loss previously recorded unless the actual selling price exceeds the original carrying value. At the time of each announced closure, we generally expect to record future period costs for equipment relocation, facility carrying costs, costs to terminate a lease or contract before the end of its term and employee-related costs. Although specific circumstances vary, our strategy has generally been to consolidate our sales and operations into large well-equipped plants that operate at high utilization rates and take advantage of available capacity created by operational excellence initiatives and/or further optimize our system following mergers and acquisitions or a changing business environment. Therefore, we have transferred a substantial portion of each closed plant’s assets and production to our other plants. We believe these actions have allowed us to more effectively manage our business. Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Cumulative Total Expected Corrugated Packaging Net property, plant and equipment costs $ 4.0 $ 0.3 $ 7.1 $ 0.9 $ 205.2 $ 205.2 Severance and other employee costs 4.1 1.3 10.7 2.4 53.1 53.5 Equipment and inventory relocation costs 1.0 1.6 1.4 3.1 9.1 10.6 Facility carrying costs 0.9 1.0 2.0 1.8 30.7 32.3 Other costs 0.3 0.1 0.3 (0.2 ) 13.4 17.4 Restructuring total $ 10.3 $ 4.3 $ 21.5 $ 8.0 $ 311.5 $ 319.0 Consumer Packaging Net property, plant and equipment costs $ (0.2 ) $ 3.4 $ (0.2 ) $ 4.4 $ 37.8 $ 37.8 Severance and other employee costs 2.9 5.3 2.8 3.4 38.1 38.3 Equipment and inventory relocation costs 0.4 1.1 0.7 1.5 6.0 7.0 Facility carrying costs 0.2 0.2 — 0.6 2.0 2.0 Other costs 2.7 2.4 3.2 2.1 25.3 25.8 Restructuring total $ 6.0 $ 12.4 $ 6.5 $ 12.0 $ 109.2 $ 110.9 Land and Development Net property, plant and equipment costs $ — $ — $ — $ — $ 1.8 $ 1.8 Severance and other employee costs 0.2 0.2 0.1 0.6 13.8 13.8 Other costs — — — — 3.0 3.0 Restructuring total $ 0.2 $ 0.2 $ 0.1 $ 0.6 $ 18.6 $ 18.6 Corporate Net property, plant and equipment costs $ — $ — $ — $ — $ 1.4 $ 1.4 Severance and other employee costs 5.6 (0.1 ) 19.8 0.1 120.5 120.5 Other costs 2.2 4.4 2.1 4.9 17.6 17.6 Restructuring total $ 7.8 $ 4.3 $ 21.9 $ 5.0 $ 139.5 $ 139.5 Total Net property, plant and equipment costs $ 3.8 $ 3.7 $ 6.9 $ 5.3 $ 246.2 $ 246.2 Severance and other employee costs 12.8 6.7 33.4 6.5 225.5 226.1 Equipment and inventory relocation costs 1.4 2.7 2.1 4.6 15.1 17.6 Facility carrying costs 1.1 1.2 2.0 2.4 32.7 34.3 Other costs 5.2 6.9 5.6 6.8 59.3 63.8 Restructuring total $ 24.3 $ 21.2 $ 50.0 $ 25.6 $ 578.8 $ 588.0 “ Net property, plant and equipment costs Note 4 Other Costs Our other costs consist of acquisition, divestiture and integration costs. We incur costs when we acquire or divest businesses. Acquisition costs include costs associated with transactions, whether consummated or not, such as advisory, legal, accounting and other professional or consulting fees, as well as potential litigation costs associated with those activities. We incur integration costs pre- and post-acquisition that reflect work being performed to facilitate merger and acquisition integration, such as work associated with information systems and other projects including spending to support future acquisitions, and primarily consist of professional services and labor. Divestiture costs consist primarily of similar professional fees. We consider acquisition, divestiture and integration costs to be Corporate costs regardless of the segment or segments involved in the transaction. The following table presents our acquisition, divestiture and integration costs (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Acquisition costs $ 3.0 $ 5.7 $ 27.0 $ 7.6 Divestiture costs 0.1 (0.1 ) 0.2 0.2 Integration costs 7.4 4.9 12.0 14.6 Other total $ 10.5 $ 10.5 $ 39.2 $ 22.4 The following table summarizes the changes in the restructuring accrual, which is primarily composed of lease commitments, accrued severance and other employee costs, and presents a reconciliation of the restructuring accrual charges to the line item “ Restructuring and other costs Six Months Ended March 31, 2019 2018 Accrual at beginning of fiscal year $ 31.6 $ 47.4 Additional accruals 32.3 8.0 Payments (24.2 ) (17.7 ) Adjustment to accruals (2.7 ) 1.4 Foreign currency rate changes (0.1 ) (0.3 ) Accrual at March 31 $ 36.9 $ 38.8 Reconciliation of accruals and charges to restructuring and other costs (in millions): Six Months Ended March 31, 2019 2018 Additional accruals and adjustments to accruals (see table above) $ 29.6 $ 9.4 Acquisition costs 27.0 7.6 Integration costs 12.0 14.6 Divestiture costs 0.2 0.2 Net property, plant and equipment 6.9 5.3 Severance and other employee costs 6.3 0.4 Equipment and inventory relocation costs 2.1 4.6 Facility carrying costs 2.0 2.4 Other costs 3.1 3.5 Total restructuring and other costs $ 89.2 $ 48.0

Retirement Plans

Retirement Plans	6 Months Ended
	Mar. 31, 2019
Retirement Plans [Abstract]
Retirement Plans	Note 5. Retirement Plans We have defined benefit pension plans and other postretirement benefit plans for certain U.S. and non-U.S. employees. Certain plans have been frozen for salaried and non-union hourly employees at various times in the past, although some employees meeting certain criteria are still accruing benefits. In addition, we participate in several multiemployer pension plans (“ MEPP MEPPs Note 4. Retirement Plans In connection with the KapStone Acquisition, the KapStone Paper and Packaging Corporation Defined Benefit Retirement Plan assigned the role of plan sponsor to WestRock. On December 31, 2018, WestRock merged the KapStone Paper and Packaging Corporation Defined Benefit Retirement Plan into the WestRock Company Consolidated Pension Plan. Upon the merger, the terms and provisions of the legacy KapStone plan were incorporated into the WestRock Company Consolidated Pension Plan. MEPPs In the normal course of business, we evaluate our potential exposure to MEPPs, including with respect to potential withdrawal liabilities. During the three months ended December 31, 2017, we submitted formal notification to withdraw from the Pace Industry Union-Management Pension Fund (“ PIUMPF See “ Note 4. Retirement Plans — Multiemployer Plans The following table presents a summary of the components of net pension (income) cost (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Service cost $ 11.4 $ 12.5 $ 22.3 $ 24.1 Interest cost 58.7 51.3 115.2 102.2 Expected return on plan assets (85.9 ) (82.5 ) (168.8 ) (164.6 ) Amortization of net actuarial loss 5.4 4.6 12.4 9.2 Amortization of prior service cost 1.3 1.1 2.6 2.2 Curtailment loss 0.9 — 0.9 — Company defined benefit plan income (8.2 ) (13.0 ) (15.4 ) (26.9 ) Multiemployer pension withdrawals — — — 180.0 Multiemployer and other plans 0.1 0.3 0.3 1.1 Net pension (income) cost $ (8.1 ) $ (12.7 ) $ (15.1 ) $ 154.2 During the three and six months ended March 31, 2019, we made contributions to our qualified and supplemental defined benefit pension plans of $5.5 million and $9.5 million, respectively, and for the three and six months ended March 31, 2018, we made contributions of $12.2 million and $20.7 million, respectively. We maintain other postretirement benefit plans that provide certain health care and life insurance benefits for certain salaried and hourly employees who meet specified age and service requirements as defined by the plans. The following table presents a summary of the components of the net postretirement cost (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Service cost $ 0.3 $ 0.4 $ 0.6 $ 0.8 Interest cost 2.0 2.0 3.9 4.0 Amortization of net actuarial gain (0.4 ) (0.1 ) (0.8 ) (0.1 ) Amortization of prior service credit (0.7 ) (1.0 ) (1.4 ) (2.1 ) Net postretirement cost $ 1.2 $ 1.3 $ 2.3 $ 2.6 During the three and six months ended March 31, 2019, we funded an aggregate of $1.7 million and $4.4 million, respectively, and for the three and six months ended March 31, 2018, we funded an aggregate of $2.0 million and $4.8 million, respectively, to our other postretirement benefit plans.

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 6. Income Taxes The effective tax rate for the three and six months ended March 31, 2019 was an expense of 22.6% and 26.7%, respectively. The effective tax rate for the three months ended March 31, 2019 was higher than the statutory federal rate primarily due to (i) the inclusion of state taxes, (ii) income derived from certain foreign jurisdictions subject to higher tax rates, (iii) the exclusion of tax benefits related to losses recorded by certain foreign operations, partially offset by (iv) the inclusion of tax benefits related to share-based compensation and (v) research and development tax credits. The effective tax rate for the six months ended March 31, 2019 was higher than the statutory federal rate primarily due to (i) the inclusion of state taxes, (ii) income derived from certain foreign jurisdictions subject to higher tax rates, (iii) the exclusion of tax benefits related to losses recorded by certain foreign operations, (iv) the limitation of certain transaction costs and (v) the increase of deferred tax liabilities in certain state jurisdictions, partially offset by (vi) the inclusion of tax benefits related to share-based compensation, (vii) research and development tax credits and (viii) an adjustment of the valuation allowance against net operating losses of foreign subsidiaries. The effective tax rate for the three and six months ended March 31, 2018 was an expense of 7.7% and a benefit of 347.3%, respectively. The effective tax rate for the three months ended March 31, 2018 was lower than the statutory federal rate primarily due to (i) the provisional amounts related to the enactment of the Tax Act, (ii) favorable tax items, such as the domestic production deduction, the tax benefits related to share-based compensation and cash tax planning that resulted in reduced deferred tax liabilities, partially offset by (iii) the inclusion of state taxes and (iv) the exclusion of tax benefits related to losses recorded by certain foreign operations. The effective tax rate for the six months ended March 31, 2018 was lower than the statutory federal rate primarily due to (i) the provisional amounts related to the enactment of the Tax Act, (ii) favorable tax items, such as the domestic production deduction, the tax benefits related to share-based compensation and cash tax planning that resulted in reduced deferred tax liabilities, partially offset by (iii) the inclusion of state taxes and (iv) the exclusion of tax benefits related to losses recorded by certain foreign operations. In December 2017, the SEC staff issued Staff Accounting Bulletin (“ SAB Note 5. Income Taxes The following table sets forth the changes in the reserve for uncertain tax positions during the six months ended March 31, 2019 (in millions): Balance at beginning of fiscal year $ 127.1 Additions related to purchase accounting (1) 1.0 Additions for tax positions taken in current year (2) 102.8 Additions for tax positions taken in prior fiscal years 1.0 Additions for currency translation adjustments 0.6 Reductions as a result of a lapse of the applicable statute of limitations (0.7 ) Balance at March 31, 2019 $ 231.8 (1) Adjustment in fiscal 2019 relates to the KapStone Acquisition. (2) Additions for tax positions taken in current fiscal year includes primarily positions taken related to foreign subsidiaries. Beginning in fiscal 2019, the Tax Act imposed a provision for the Global Intangible Low-taxed Income (“ GILTI

Segment Information

Segment Information	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	Note 7. We report our financial results of operations in the following three reportable segments: Corrugated Packaging, which consists of our containerboard mill, corrugated packaging and distribution operations, as well as our merchandising displays and recycling procurement operations; Consumer Packaging, which consists of our consumer mills, folding carton, beverage and partition operations; and Land and Development, which sells real estate primarily in the Charleston, SC region. Effective in the first quarter of fiscal 2019, we aligned our financial results for all periods presented move our merchandising displays operations from our Consumer Packaging segment to our Corrugated Packaging segment and to allocate certain previously non-allocated costs and certain pension and other postretirement non-service income to our reportable segments. The following table shows selected operating data for our segments (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Net sales (aggregate): Corrugated Packaging $ 2,990.7 $ 2,391.3 $ 5,724.5 $ 4,711.0 Consumer Packaging 1,668.3 1,637.3 3,287.1 3,238.6 Land and Development 0.8 26.7 14.7 38.1 Total $ 4,659.8 $ 4,055.3 $ 9,026.3 $ 7,987.7 Less net sales (intersegment): Corrugated Packaging $ 19.4 $ 22.0 $ 37.4 $ 41.4 Consumer Packaging 20.4 16.3 41.5 35.3 Total $ 39.8 $ 38.3 $ 78.9 $ 76.7 Net sales (unaffiliated customers): Corrugated Packaging $ 2,971.3 $ 2,369.3 $ 5,687.1 $ 4,669.6 Consumer Packaging 1,647.9 1,621.0 3,245.6 3,203.3 Land and Development 0.8 26.7 14.7 38.1 Total $ 4,620.0 $ 4,017.0 $ 8,947.4 $ 7,911.0 Segment income: Corrugated Packaging $ 310.3 $ 262.8 $ 557.1 $ 532.7 Consumer Packaging 85.2 94.6 162.1 188.8 Land and Development 0.5 16.1 1.2 15.4 Segment income 396.0 373.5 720.4 736.9 Gain on sale of certain closed facilities — — 50.5 — Multiemployer pension withdrawals — — — (180.0 ) Land and Development impairments (13.0 ) — (13.0 ) (27.6 ) Restructuring and other costs (34.8 ) (31.7 ) (89.2 ) (48.0 ) Non-allocated expenses (24.4 ) (21.4 ) (43.4 ) (37.3 ) Interest expense, net (111.8 ) (78.3 ) (206.2 ) (143.1 ) Gain (loss) on extinguishment of debt 0.4 0.1 (1.5 ) (0.9 ) Other (expense) income, net (3.3 ) 1.1 (6.0 ) 3.6 Income before income taxes $ 209.1 $ 243.3 $ 411.6 $ 303.6 In October 2018, our containerboard and pulp mill located in Panama City, FL sustained extensive damage from Hurricane Michael. In the three and six months ended March 31, 2019, we received $60.0 million and $80.0 million of insurance proceeds, respectively, in our Corrugated Packaging segment related primarily to the Panama City mill. The proceeds received were recorded in the condensed consolidated statements of income in cost of goods sold. The following table shows selected operating data for our segments (in millions): March 31, 2019 September 30, 2018 Identifiable assets: Corrugated Packaging $ 16,775.2 $ 11,069.6 Consumer Packaging 11,220.3 11,511.1 Land and Development 34.4 49.1 Assets held for sale 33.5 59.5 Corporate 2,629.6 2,671.2 Total $ 30,693.0 $ 25,360.5 The changes in the carrying amount of goodwill during the six months ended March 31, 2019 is as follows (in millions): Corrugated Packaging Consumer Packaging Total Balance as of September 30, 2018 Goodwill $ 1,966.8 $ 3,653.6 $ 5,620.4 Accumulated impairment losses (0.1 ) (42.7 ) (42.8 ) 1,966.7 3,610.9 5,577.6 Goodwill acquired 1,735.0 — 1,735.0 Purchase price allocation adjustments 0.9 (0.6 ) 0.3 Translation adjustments 2.8 (14.8 ) (12.0 ) Balance as of March 31, 2019 Goodwill 3,705.5 3,638.2 7,343.7 Accumulated impairment losses (0.1 ) (42.7 ) (42.8 ) $ 3,705.4 $ 3,595.5 $ 7,300.9

Inventories

Inventories	6 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	Note 8. Inventories We value substantially all of our U.S. inventories at the lower of cost or market, with cost determined on a last-in first-out (“ LIFO FIFO March 31, 2019 September 30, 2018 Finished goods and work in process $ 956.5 $ 867.0 Raw materials 844.0 730.0 Spare parts and supplies 460.8 368.2 Inventories at FIFO cost 2,261.3 1,965.2 LIFO reserve (164.4 ) (135.6 ) Net inventories $ 2,096.9 $ 1,829.6

Assets Held For Sale

Assets Held For Sale	6 Months Ended
	Mar. 31, 2019
Assets Held For Sale [Abstract]
Assets Held for Sale	Note 9. Assets Held For Sale Due to our accelerated monetization strategy, our Land and Development portfolio has met the held for sale criteria and is classified as assets held for sale. Assets held for sale at March 31, 2019 and September 30, 2018 of $33.5 million and $59.5 million, respectively, include $22.1 million and $33.5 million, respectively, of Land and Development portfolio assets. The remainder is primarily related to closed facilities.

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Mar. 31, 2019
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	Note 10. Property, Plant and Equipment The components of property, plant and equipment were as follows (in millions): March 31, 2019 September 30, 2018 Property, plant and equipment at cost: Land and buildings $ 2,360.9 $ 2,078.9 Machinery and equipment 14,206.1 12,064.0 Forestlands and mineral rights 149.9 158.0 Transportation equipment 31.0 30.1 Leasehold improvements 100.2 88.9 16,848.1 14,419.9 Less: accumulated depreciation, depletion and amortization (5,818.7 ) (5,337.4 ) Property, plant and equipment, net $ 11,029.4 $ 9,082.5

Fair Value

Fair Value	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value	Note 11. Fair Value Assets and Liabilities Measured or Disclosed at Fair Value We estimate fair values in accordance with ASC 820, “Fair Value Measurement Note 12. Fair Value “ Note 12. Debt ” of the Notes to Condensed Consolidated Financial Statements. Note 4. Retirement Plans Financial Instruments Not Recognized at Fair Value Financial instruments not recognized at fair value on a recurring or nonrecurring basis include cash and cash equivalents, accounts receivable, certain other current assets, short-term debt, accounts payable, certain other current liabilities and long-term debt. With the exception of long-term debt, the carrying amounts of these financial instruments approximate their fair values due to their short maturities. Fair Value of Nonfinancial Assets and Nonfinancial Liabilities We measure certain nonfinancial assets and nonfinancial liabilities at fair value on a nonrecurring basis. These assets and liabilities include cost and equity method investments when they are deemed to be other-than-temporarily impaired, assets acquired and liabilities assumed in an acquisition or in a nonmonetary exchange, and property, plant and equipment and intangible assets that are written down to fair value when they are held for sale or determined to be impaired. During the three and six months ended March 31, 2019 and 2018, we did not have any significant nonfinancial assets or nonfinancial liabilities that were measured at fair value on a nonrecurring basis in periods subsequent to initial recognition other than in the second quarter of fiscal 2019 when we recorded a $13.0 million pre-tax non-cash impairment of certain mineral rights and the first quarter of fiscal 2018 when we recorded a $27.6 million pre-tax non-cash impairment of certain mineral rights and real estate. The $23.6 million impairment of mineral rights was driven by the non-renewal of a lease and associated with declining oil and gas prices, and the other $4.0 million was recorded in connection with the write-down of the carrying value of real estate projects where the projected sales proceeds were less than the carrying value. Accounts Receivable Sales Agreement We had an accounts receivable sales agreement (the “ Prior A/R Sales Agreement On September 25, 2018, we entered into an agreement for the purchasing and servicing of receivables (the “ A/R Sales Agreement Transfers and Servicing The following table presents a summary of the activity under the A/R Sales Agreement and the Prior A/R Sales Agreement for the six months ended March 31, 2019 and March 31, 2018 (in millions): Six Months Ended March 31, 2019 2018 Receivable from financial institution at beginning of fiscal year $ — $ 24.9 Receivables sold to the financial institution and derecognized 943.0 790.2 Receivables collected by financial institution (956.4 ) (783.3 ) Cash paid to (proceeds from) financial institution 13.4 (10.0 ) Receivable $ — $ 21.8 The October 1, 2018 adoption of ASU 2016-15 resulted in a change in classification of proceeds received for beneficial interests obtained from transferring trade receivables in securitization transactions as cash provided by investing activities instead of cash provided by operating activities in the statement of cash flows. Although this aspect of the ASU does not have a material effect on our consolidated financial statements on a prospective basis (from October 1, 2018) because the creation of beneficial interest was eliminated under the terms of the A/R Sales Agreement effective September 25, 2018, we have applied the provisions of this ASU retrospectively to prior years. As a result, cash provided by operating activities for the six months ended March 31, 2018 decreased by $253.1 million with a corresponding increase to cash provided by investing activities. Based on current rates and levels of receivables sold, the expense recorded in connection with the sale is approximately $4 million per quarter and is recorded in “other (expense) income, net”. The future amount may fluctuate based on the level of activity and other factors. Although the sales are made without recourse, we maintain continuing involvement with the sold receivables as we provide collections services related to the transferred assets. The associated servicing liability is not material given the high quality of the customers underlying the receivables and the anticipated short collection period.

Debt

Debt	6 Months Ended
	Mar. 31, 2019
Debt [Abstract]
Debt	Note 12. Debt See “ Note 13. Debt The following table shows the carrying value of the individual components of our debt (in millions): March 31, 2019 September 30, 2018 Public bonds due fiscal 2019 to 2022 $ 1,114.1 $ 1,470.9 Public bonds due fiscal 2023 to 2028 3,271.3 2,534.4 Public bonds due fiscal 2029 to 2033 1,707.8 964.1 Public bonds due fiscal 2037 to 2047 179.1 178.5 Term loan facilities 2,905.8 599.4 Revolving credit and swing facilities 527.2 355.0 Receivables-backed financing facility 150.0 — Commercial paper 588.3 — Capital lease obligations 189.0 171.0 Supplier financing and commercial card programs 130.1 105.1 International and other debt 32.8 36.8 Total debt 10,795.5 6,415.2 Less: current portion of debt 1,422.4 740.7 Long-term debt due after one year $ 9,373.1 $ 5,674.5 A portion of the debt classified as long-term may be paid down earlier than scheduled at our discretion without penalty. Certain customary restrictive covenants govern the maximum availability under our credit facilities. We test and report our compliance with these covenants as required and were in compliance with all of our covenants at March 31, 2019. Notes Issued On December 3, 2018, WRKCo issued $750.0 million aggregate principal amount of 4.65% senior notes due 2026 (the “ 2026 Notes 2029 Notes December 2018 Notes Securities Act MWV RKT Exchanged Notes During the quarter ended March 31, 2019, we conducted offers to exchange WRKCo’s $500.0 million aggregate principal amount of 3.00% Senior Notes due 2024 (the “ 2024 Notes 2025 Notes 2027 Notes 2028 Notes Delayed Draw Credit Facilities On March 7, 2018, we entered into a credit agreement that provides for $3.8 billion of senior unsecured term loans, consisting of a 364-day $300.0 million term loan, a 3-year $1.75 billion term loan and a 5-year $1.75 billion term loan (collectively, the “ Delayed Draw Credit Facilities On November 2, 2018, in connection with the closing of the KapStone Acquisition, we drew upon the facility in full. The proceeds of the Delayed Draw Credit Facilities and other sources of cash were used to pay the consideration for the KapStone Acquisition, to repay certain existing indebtedness of KapStone and to pay fees and expenses incurred in connection with the KapStone Acquisition. The Delayed Draw Credit Facilities are senior unsecured obligations of , as borrower, and each of the Company, RKT and MWV, respectively, as guarantors. On December 3, 2018, in connection with the issuance of the December 2018 Notes, we repaid the $300.0 million 364-day term loan under the Delayed Draw Credit Facilities, and prepaid $926.5 million of the 3-year term loan and $262.5 million of the 5-year term loan. At March 31, 2019, there was $822.5 million outstanding on the 3-year term loan and $1,483.9 million outstanding on the 5-year term loan. At our option, loans issued under the Delayed Draw Credit Facilities will bear interest at a floating rate based on either LIBOR or an alternate base rate, in each case plus an applicable interest rate margin. The applicable interest rate margin was initially 1.125% to 2.000% per annum for LIBOR rate loans and 0.125% to 1.000% per annum for alternate base rate loans, in each case depending on the Leverage Ratio (as defined in the credit agreement) or our corporate credit ratings, whichever yields a lower applicable interest rate margin, at such time. On February 26, 2019, we amended the Delayed Draw Credit Facilities agreement. The applicable interest rate margin for the 3-year term loan is now 1.000% to 1.875% for LIBOR rate loans and 0.000% to 0.875% for alternate base rate loans. The applicable interest rate margin for the 5-year term loan is now 1.000% to 1.950% for LIBOR rate loans and 0.000% to 0.950% for alternate base rate loans. Loans under the Delayed Draw Credit Facilities may be prepaid at any time without premium. We have recorded debt issuance costs of $7.5 million, which are being amortized over the respective terms of the Delayed Draw Credit Facilities. Receivables-Backed Financing Facility On July 22, 2016, we entered into a $700.0 million sixth amended and restated receivables sale agreement with certain originators (the “ Receivables Facility European Revolving Credit Facility On April 27, 2018, we entered into a €500.0 million revolving credit facility with an incremental €100.0 million accordion feature with Coöperatieve Rabobank U.A., New York Branch as the administrative agent for the syndicate of banks. This facility provides for a 3-year unsecured U.S. dollar, Euro and Sterling denominated borrowing of not more than €500.0 million and matures on April 27, 2021. At March 31, 2019 Commercial Paper Program On October 31, 2017, we established an unsecured commercial paper program, pursuant to which we were able to issue short-term, unsecured commercial paper notes in an aggregate principal amount at any time not to exceed $1.0 billion with up to 397-day maturities. On December 7, 2018, we terminated the commercial paper program and established a new unsecured commercial paper program with WRKCo as the issuer. Under the new program, we may issue short-term unsecured commercial paper notes in an aggregate principal amount at any time not to exceed $1.0 billion with up to 397-day maturities. The commercial paper program has no expiration date and can be terminated by either the agent or us with not less than 30 days’ notice. Our $2.0 billion unsecured revolving credit facility is intended to backstop the commercial paper program. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds from issuances of notes under the program were used to repay amounts outstanding under the KapStone securitization facility that was assumed in the KapStone Acquisition and subsequently terminated, and have been, and are expected to continue to be, used for general corporate purposes. At March 31, 2019, there was $588.3 million outstanding and the average borrowing rate was 2.77%. As of , Brazil Delayed Draw Credit Facilities On April 10, 2019, we entered into a credit agreement to provide for BRL 750.0 million of senior unsecured term loans with an incremental BRL 250.0 million accordion feature (the “ Brazil Delayed Draw Credit Facilities As of , the aggregate maturities of debt, excluding capital lease obligations, for the remainder of the current fiscal year and the succeeding four fiscal years and thereafter were as follows (in millions): Remaining fiscal 2019 $ 1,056.6 Fiscal 2020 468.2 Fiscal 2021 352.7 Fiscal 2022 2,251.8 Fiscal 2023 527.7 Thereafter 5,766.6 Fair value of debt step-up, deferred financing costs and unamortized bond discounts 182.9 Total $ 10,606.5 As of March 31, 2019 Remaining fiscal 2019 $ 3.5 Fiscal 2020 6.1 Fiscal 2021 4.3 Fiscal 2022 3.5 Fiscal 2023 1.9 Thereafter 151.8 Fair value of debt step-up, deferred financing costs and unamortized bond discounts 17.9 Total $ 189.0

Selected Condensed Consolidatin

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors	6 Months Ended
	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors	Note 13. Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors The 2024 Notes, the 2025 Notes, the 2026 Notes, the 2027 Notes, the 2028 Notes and the 2029 Notes (the “ Notes Issuer Subsidiary Guarantors Parent In accordance with GAAP, we retrospectively account for changes in our legal structure that constitute transfers of businesses between issuers, guarantors and non-guarantors. As such, our prior period financials may vary from those previously reported. The information in the tables reflect such revisions, as well as revisions to correct immaterial errors in the prior presentation of our financial statements. In accordance with Rule 3-10 of Regulation S-X, the following tables present condensed consolidating financial data of the Parent, the Issuer, the Subsidiary Guarantors, the non-guarantor subsidiaries and eliminations. Such financial data include the related Condensed Consolidating Statements of Income for the three and six months ended March 31, 2019 and March 31, 2018, Condensed Consolidating Balance Sheets as of March 31, 2019 and September 30, 2018 and Condensed Consolidating Statements of Cash Flows for the six months ended March 31, 2019 and March 31, 2018. CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 639.2 $ 4,638.1 $ (657.3 ) $ 4,620.0 Cost of goods sold — — 526.8 3,850.9 (657.3 ) 3,720.4 Selling, general and administrative, excluding intangible amortization — 0.3 14.2 429.6 — 444.1 Selling, general and administrative intangible amortization — — 26.3 76.1 — 102.4 Land and Development impairments — — — 13.0 — 13.0 Restructuring and other costs — 3.9 — 30.9 — 34.8 Operating profit (loss) — (4.2 ) 71.9 237.6 — 305.3 Interest expense, net — (65.0 ) (42.0 ) (4.8 ) — (111.8 ) Intercompany interest income (expense), net — 0.5 (27.5 ) 27.0 — — Gain on extinguishment of debt — — 0.4 — — 0.4 Pension and other postretirement non- service (expense) income — — (1.7 ) 20.4 — 18.7 Other (expense) income, net — (3.4 ) (1.0 ) 1.1 — (3.3 ) Equity in income of unconsolidated entities — — — (0.2 ) — (0.2 ) Equity in income of consolidated entities 160.4 196.9 168.8 — (526.1 ) — Income before income taxes 160.4 124.8 168.9 281.1 (526.1 ) 209.1 Income tax benefit (expense) — 14.1 0.6 (61.9 ) — (47.2 ) Consolidated net income 160.4 138.9 169.5 219.2 (526.1 ) 161.9 Less: Net income attributable to noncontrolling interests — — — (1.5 ) — (1.5 ) Net income attributable to common stockholders $ 160.4 $ 138.9 $ 169.5 $ 217.7 $ (526.1 ) $ 160.4 Comprehensive income attributable to common stockholders $ 189.7 $ 168.3 $ 201.6 $ 247.0 $ (616.9 ) $ 189.7 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 1,263.0 $ 8,971.9 $ (1,287.5 ) $ 8,947.4 Cost of goods sold — — 1,027.7 7,525.8 (1,287.5 ) 7,266.0 Selling, general and administrative, excluding intangible amortization — 0.4 27.3 817.3 — 845.0 Selling, general and administrative intangible amortization — — 52.3 143.0 — 195.3 Gain on disposal of assets — — — (43.8 ) — (43.8 ) Land and Development impairments — — — 13.0 — 13.0 Restructuring and other costs — 3.9 0.1 85.2 — 89.2 Operating profit (loss) — (4.3 ) 155.6 431.4 — 582.7 Interest expense, net — (112.0 ) (91.9 ) (2.3 ) — (206.2 ) Intercompany interest income (expense), net — 3.5 (54.6 ) 51.1 — — (Loss) gain on extinguishment of debt — (1.8 ) 0.4 (0.1 ) — (1.5 ) Pension and other postretirement non- service (expense) income — — (3.4 ) 39.4 — 36.0 Other expense, net — (4.0 ) (0.4 ) (1.6 ) — (6.0 ) Equity in income of unconsolidated entities — — — 6.6 — 6.6 Equity in income of consolidated entities 299.5 396.7 417.3 — (1,113.5 ) — Income before income taxes 299.5 278.1 423.0 524.5 (1,113.5 ) 411.6 Income tax benefit (expense) — 29.0 (1.3 ) (137.6 ) — (109.9 ) Consolidated net income 299.5 307.1 421.7 386.9 (1,113.5 ) 301.7 Less: Net income attributable to noncontrolling interests — — — (2.2 ) — (2.2 ) Net income attributable to common stockholders $ 299.5 $ 307.1 $ 421.7 $ 384.7 $ (1,113.5 ) $ 299.5 Comprehensive income attributable to common stockholders $ 269.3 $ 277.1 $ 394.5 $ 354.7 $ (1,026.3 ) $ 269.3 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 633.7 $ 4,034.3 $ (651.0 ) $ 4,017.0 Cost of goods sold — — 512.1 3,366.5 (651.0 ) 3,227.6 Selling, general and administrative, excluding intangible amortization — 0.4 24.9 370.5 — 395.8 Selling, general and administrative intangible amortization — — 26.1 49.1 — 75.2 Loss on disposal of assets — — 0.1 2.7 — 2.8 Restructuring and other costs — 2.5 4.2 25.0 — 31.7 Operating profit (loss) — (2.9 ) 66.3 220.5 — 283.9 Interest expense, net (0.1 ) (28.6 ) (43.5 ) (6.1 ) — (78.3 ) Intercompany interest income (expense), net — 6.2 (16.5 ) 10.3 — — (Loss) gain on extinguishment of debt — (0.7 ) 0.9 (0.1 ) — 0.1 Pension and other postretirement non- service (expense) income — — (0.2 ) 24.8 — 24.6 Other income (expense), net — 0.6 2.6 (2.1 ) — 1.1 Equity in income of unconsolidated entities — — — 11.9 — 11.9 Equity in income of consolidated entities — 242.4 129.5 — (371.9 ) — Income (loss) before income taxes (0.1 ) 217.0 139.1 259.2 (371.9 ) 243.3 Income tax benefit (expense) — 6.3 (0.1 ) (25.0 ) — (18.8 ) Consolidated net income (loss) (0.1 ) 223.3 139.0 234.2 (371.9 ) 224.5 Less: Net income attributable to noncontrolling interests — — — (1.3 ) — (1.3 ) Net income (loss) attributable to common stockholders $ (0.1 ) $ 223.3 $ 139.0 $ 232.9 $ (371.9 ) $ 223.2 Comprehensive income (loss) attributable to common stockholders $ (0.1 ) $ 279.2 $ 213.9 $ 288.8 $ (502.7 ) $ 279.1 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Six Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 1,243.8 $ 7,958.0 $ (1,290.8 ) $ 7,911.0 Cost of goods sold — — 959.6 6,679.3 (1,290.8 ) 6,348.1 Selling, general and administrative, excluding intangible amortization — 0.4 49.3 726.9 — 776.6 Selling, general and administrative intangible amortization — — 52.1 95.6 — 147.7 Loss on disposal of assets — — 0.1 3.8 — 3.9 Multiemployer pension withdrawal — 6.5 12.5 161.0 — 180.0 Land and Development impairments — — — 27.6 — 27.6 Restructuring and other costs — 3.3 5.3 39.4 — 48.0 Operating profit (loss) — (10.2 ) 164.9 224.4 — 379.1 Interest expense, net (0.1 ) (43.9 ) (87.7 ) (11.4 ) — (143.1 ) Intercompany interest income (expense), net — 11.8 (32.3 ) 20.5 — — (Loss) gain on extinguishment of debt — (1.6 ) 0.9 (0.2 ) — (0.9 ) Pension and other postretirement non- service (expense) income — — (0.3 ) 49.5 — 49.2 Other income (expense), net — 1.0 4.3 (1.7 ) — 3.6 Equity in income of unconsolidated entities — — 2.5 13.2 — 15.7 Equity in income of consolidated entities — 1,394.4 1,023.1 — (2,417.5 ) — Income (loss) before income taxes (0.1 ) 1,351.5 1,075.4 294.3 (2,417.5 ) 303.6 Income tax benefit — 6.9 124.4 923.1 — 1,054.4 Consolidated net income (loss) (0.1 ) 1,358.4 1,199.8 1,217.4 (2,417.5 ) 1,358.0 Less: Net loss attributable to noncontrolling interests — — — 0.3 — 0.3 Net income (loss) attributable to common stockholders $ (0.1 ) $ 1,358.4 $ 1,199.8 $ 1,217.7 $ (2,417.5 ) $ 1,358.3 Comprehensive income (loss) attributable to common stockholders $ (0.1 ) $ 1,374.0 $ 1,229.5 $ 1,233.6 $ (2,463.1 ) $ 1,373.9 CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 19.6 $ 134.6 $ — $ 154.2 Accounts receivable — — 182.8 2,217.5 (33.3 ) 2,367.0 Inventories — — 254.8 1,842.1 — 2,096.9 Other current assets 0.5 0.7 8.2 553.0 — 562.4 Intercompany receivables — 154.0 23.0 485.6 (662.6 ) — Assets held for sale — — — 33.5 — 33.5 Total current assets 0.5 154.7 488.4 5,266.3 (695.9 ) 5,214.0 Property, plant and equipment, net — — 22.2 11,007.2 — 11,029.4 Goodwill — — 1,151.3 6,149.6 — 7,300.9 Intangibles, net — — 1,537.1 2,740.8 — 4,277.9 Restricted assets held by special purpose entities — — — 1,277.7 — 1,277.7 Prepaid pension asset — — — 447.7 — 447.7 Intercompany notes receivable — 155.0 31.9 2,941.1 (3,128.0 ) — Investments in consolidated subsidiaries 11,797.4 18,075.3 19,938.9 — (49,811.6 ) — Other assets — 14.2 181.4 959.4 (9.6 ) 1,145.4 Total Assets $ 11,797.9 $ 18,399.2 $ 23,351.2 $ 30,789.8 $ (53,645.1 ) $ 30,693.0 LIABILITIES AND EQUITY Current liabilities: Current portion of debt $ — $ 405.6 $ 603.8 $ 413.0 $ — $ 1,422.4 Accounts payable — 1.1 34.7 1,699.5 (33.3 ) 1,702.0 Accrued compensation and benefits 0.1 — 10.2 370.3 — 380.6 Other current liabilities — 7.3 99.1 435.2 — 541.6 Intercompany payables 157.0 504.5 0.8 0.3 (662.6 ) — Total current liabilities 157.1 918.5 748.6 2,918.3 (695.9 ) 4,046.6 Long-term debt due after one year — 6,223.9 2,101.7 1,047.5 — 9,373.1 Intercompany notes payable — — 2,941.1 186.9 (3,128.0 ) — Pension liabilities, net of current portion — — 135.4 115.6 — 251.0 Postretirement benefit liabilities, net of current portion — — 28.0 113.5 — 141.5 Non-recourse liabilities held by special purpose entities — — — 1,149.5 — 1,149.5 Deferred income taxes — — 267.3 2,697.5 (9.6 ) 2,955.2 Other long-term liabilities — 14.6 135.7 969.0 — 1,119.3 Redeemable noncontrolling interests — — — 3.2 — 3.2 Total stockholders’ equity 11,640.8 11,242.2 16,993.4 21,576.0 (49,811.6 ) 11,640.8 Noncontrolling interests — — — 12.8 — 12.8 Total equity 11,640.8 11,242.2 16,993.4 21,588.8 (49,811.6 ) 11,653.6 Total Liabilities and Equity $ 11,797.9 $ 18,399.2 $ 23,351.2 $ 30,789.8 $ (53,645.1 ) $ 30,693.0 CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total ASSETS Current Assets: Cash and cash equivalents $ — $ 0.2 $ 490.8 $ 145.8 $ — $ 636.8 Accounts receivable — 0.1 196.5 1,840.2 (26.1 ) 2,010.7 Inventories — — 233.4 1,596.2 — 1,829.6 Other current assets — 0.4 17.2 230.9 — 248.5 Intercompany receivables — 27.7 269.8 792.8 (1,090.3 ) — Assets held for sale — — — 59.5 — 59.5 Total current assets — 28.4 1,207.7 4,665.4 (1,116.4 ) 4,785.1 Property, plant and equipment, net — — 21.3 9,061.2 — 9,082.5 Goodwill — — 1,151.3 4,426.3 — 5,577.6 Intangibles, net — — 1,589.4 1,532.6 — 3,122.0 Restricted assets held by special purpose entities — — — 1,281.0 — 1,281.0 Prepaid pension asset — — — 420.0 — 420.0 Intercompany notes receivable — 884.2 33.1 2,865.4 (3,782.7 ) — Investments in consolidated subsidiaries — 13,260.3 15,066.3 — (28,326.6 ) — Other assets 3.4 12.4 172.8 910.8 (7.1 ) 1,092.3 Total Assets $ 3.4 $ 14,185.3 $ 19,241.9 $ 25,162.7 $ (33,232.8 ) $ 25,360.5 LIABILITIES AND EQUITY Current liabilities: Current portion of debt $ — $ — $ 609.5 $ 131.2 $ — $ 740.7 Accounts payable — 0.8 40.3 1,701.8 (26.1 ) 1,716.8 Accrued compensation and benefits — 0.2 10.7 388.4 — 399.3 Other current liabilities — 3.2 77.7 395.6 — 476.5 Intercompany payables 13.0 506.6 570.4 0.3 (1,090.3 ) — Total current liabilities 13.0 510.8 1,308.6 2,617.3 (1,116.4 ) 3,333.3 Long-term debt due after one year — 2,179.4 2,460.1 1,035.0 — 5,674.5 Intercompany notes payable — — 2,865.4 917.3 (3,782.7 ) — Pension liabilities, net of current portion — — 135.9 125.4 — 261.3 Postretirement benefit liabilities, net of current portion — — 28.1 106.7 — 134.8 Non-recourse liabilities held by special purpose entities — — — 1,153.7 — 1,153.7 Deferred income taxes — — 291.0 2,037.6 (7.1 ) 2,321.5 Other long-term liabilities — 16.1 106.2 872.5 — 994.8 Redeemable noncontrolling interests — — — 4.2 — 4.2 Total stockholders’ equity (9.6 ) 11,479.0 12,046.6 16,280.0 (28,326.6 ) 11,469.4 Noncontrolling interests — — — 13.0 — 13.0 Total equity (9.6 ) 11,479.0 12,046.6 16,293.0 (28,326.6 ) 11,482.4 Total Liabilities and Equity $ 3.4 $ 14,185.3 $ 19,241.9 $ 25,162.7 $ (33,232.8 ) $ 25,360.5 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Net cash provided by (used for) operating activities $ 319.1 $ (93.4 ) $ (196.9 ) $ 1,208.6 $ (572.4 ) $ 665.0 Investing activities: Capital expenditures — — (2.4 ) (623.0 ) — (625.4 ) Cash paid related to business combinations, net of cash acquired — — — (3,349.3 ) — (3,349.3 ) Investment in unconsolidated entities equipment — — — (0.2 ) — (0.2 ) Proceeds from sale of property, plant and equipment — — — 105.3 — 105.3 Proceeds from property, plant and equipment insurance settlement — — — 8.8 — 8.8 Intercompany notes issued — — — (75.7 ) 75.7 — Intercompany notes proceeds — 9.2 1.3 3,800.0 (3,810.5 ) — Intercompany capital investment (563.0 ) (563.0 ) — — 1,126.0 — Other — — 8.6 1.6 — 10.2 Net cash (used for) provided by investing activities (563.0 ) (553.8 ) 7.5 (132.5 ) (2,608.8 ) (3,850.6 ) Financing activities: Proceeds from issuance of notes — 1,498.5 — — — 1,498.5 Additions to revolving credit facilities — 67.5 — 104.5 — 172.0 Additions to debt — 3,801.9 — 156.0 — 3,957.9 Repayments of debt — (1,489.7 ) (357.5 ) (1,362.4 ) — (3,209.6 ) Changes in commercial paper, net — 588.3 — — — 588.3 Other financing additions — — — 16.6 — 16.6 Issuances of common stock, net of related minimum tax withholdings 3.2 — — — — 3.2 Purchases of common stock (88.6 ) — — — — (88.6 ) Cash dividends paid to stockholders (233.7 ) — — — — (233.7 ) Cash distributions paid to noncontrolling interests — — — (2.8 ) — (2.8 ) Intercompany notes borrowing — — 75.7 — (75.7 ) — Intercompany notes payments — (3,800.0 ) — (10.5 ) 3,810.5 — Intercompany capital receipt 563.0 — — 563.0 (1,126.0 ) — Intercompany dividends — — — (572.4 ) 572.4 — Other — (19.5 ) — 22.5 — 3.0 Net cash provided by (used for) financing activities 243.9 647.0 (281.8 ) (1,085.5 ) 3,181.2 2,704.8 Effect of exchange rate changes on cash, cash equivalents and restricted cash — — — (1.8 ) — (1.8 ) Decrease in cash, cash equivalents and restricted cash — (0.2 ) (471.2 ) (11.2 ) — (482.6 ) Cash, cash equivalents and restricted cash at beginning of period — 0.2 490.8 145.8 — 636.8 Cash, cash equivalents and restricted cash at end of period $ — $ 0.0 $ 19.6 $ 134.6 $ — $ 154.2 The Condensed Consolidating Statements of Cash Flows for the six months ended March 31, 2019 do not include non-cash transactions between Parent, Issuer, Guarantor Subsidiaries and Non-Guarantor Subsidiaries. From time to time, we may enter into non-cash transactions for simplicity of execution of intercompany transactions. These may include intercompany non-cash capitalizations, intercompany non-cash returns of capital, intercompany debt-to-equity conversions or other transactions of a similar nature. The table below summarizes these non-cash transactions. Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Intercompany receivables $ (140.9 ) $ — $ — $ — $ 140.9 $ — Intercompany payables $ — $ — $ — $ 140.9 $ (140.9 ) $ — Investing activities: Intercompany notes issued $ — $ (3,800.0 ) $ (4,519.8 ) $ (8,057.5 ) $ 16,377.3 $ — Intercompany notes proceeds $ — $ 4,519.8 $ 4,519.8 $ 4,257.5 $ (13,297.1 ) $ — Intercompany capital investment $ (10,396.2 ) $ (5,434.8 ) $ (5,983.6 ) $ — $ 21,814.6 $ — Intercompany return of capital $ 563.0 $ 1,478.0 $ 915.0 $ — $ (2,956.0 ) $ — Financing activities: Intercompany notes borrowing $ — $ 3,800.0 $ 457.5 $ 12,119.8 $ (16,377.3 ) $ — Intercompany notes payments $ — $ — $ (457.5 ) $ (12,839.6 ) $ 13,297.1 $ — Intercompany capital receipt $ — $ 10,396.2 $ 4,977.3 $ 6,441.1 $ (21,814.6 ) $ — Intercompany capital distribution $ (563.0 ) $ (563.0 ) $ (457.5 ) $ (1,372.5 ) $ 2,956.0 $ — CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Six Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Net cash provided by (used for) operating activities $ 4.0 $ (488.3 ) $ (268.8 ) $ 1,541.0 $ (314.2 ) $ 473.7 Investing activities: Capital expenditures — — (0.4 ) (426.3 ) — (426.7 ) Cash paid related to business combinations, net of cash acquired — — — (185.2 ) — (185.2 ) Cash receipts on sold trade receivables — — — 253.1 — 253.1 Investment in unconsolidated entities — — — (111.0 ) — (111.0 ) Proceeds from sale of property, plant and equipment — — — 15.7 — 15.7 Proceeds from property, plant and equipment insurance settlement — — — 4.8 — 4.8 Intercompany notes issued — — (1.4 ) (375.9 ) 377.3 — Intercompany notes proceeds — — 3.2 83.0 (86.2 ) — Intercompany capital investment — (755.3 ) (300.8 ) — 1,056.1 — Intercompany return of capital — 1,356.3 821.0 — (2,177.3 ) — Other — — 6.6 1.6 — 8.2 Net cash provided by (used for) investing activities — 601.0 528.2 (740.2 ) (830.1 ) (441.1 ) Financing activities: Proceeds from issuance of notes — 1,197.3 — — — 1,197.3 (Repayments) additions to revolving credit facilities — (59.8 ) — 154.1 — 94.3 Additions to debt — 2.7 — 850.5 — 853.2 Repayments of debt — (1,025.2 ) (14.8 ) (970.4 ) — (2,010.4 ) Changes in commercial paper, net — 63.3 — — — 63.3 Other financing repayments — — (5.9 ) (18.6 ) — (24.5 ) Issuances of common stock, net of related minimum tax withholdings — 17.4 — — — 17.4 Cash dividends paid to stockholders — (219.4 ) — — — (219.4 ) Cash distributions paid to noncontrolling interests — — — (8.6 ) — (8.6 ) Intercompany notes borrowing — — 375.9 1.4 (377.3 ) — Intercompany notes payments — (69.0 ) (14.0 ) (3.2 ) 86.2 — Intercompany capital receipt — — 736.9 319.2 (1,056.1 ) — Intercompany capital distribution — — (1,356.3 ) (821.0 ) 2,177.3 — Intercompany dividends — — — (314.2 ) 314.2 — Other (4.0 ) (20.0 ) — (0.9 ) — (24.9 ) Net cash used for financing activities (4.0 ) (112.7 ) (278.2 ) (811.7 ) 1,144.3 (62.3 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash — — (0.1 ) (1.8 ) — (1.9 ) Decrease in cash, cash equivalents and restricted cash — — (18.9 ) (12.7 ) — (31.6 ) Cash, cash equivalents and restricted cash at beginning of period — — 43.3 260.7 — 304.0 Cash, cash equivalents and restricted cash at end of period $ — $ — $ 24.4 $ 248.0 $ — $ 272.4

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2019
Commitments And Contingencies [Abstract]
Commitments and Contingencies	Note 14. Commitments and Contingencies Environmental We are subject to a broad range of foreign, federal, state and local environmental, health and safety laws and regulations, including those governing discharges to air, soil and water, the management, treatment and disposal of hazardous substances, solid waste and hazardous wastes, the investigation and remediation of contamination resulting from historical site operations and releases of hazardous substances, and the health and safety of employees. Our compliance initiatives related to these laws and regulations could result in significant costs, which could negatively impact our results of operations, financial condition and cash flows. Any failure to comply with environmental or health and safety laws and regulations, or any permits and authorizations required thereunder, could subject us to fines, corrective action or other sanctions. We have been named as a potentially responsible party (“ PRP CERCLA On January 26, 2009, Smurfit-Stone and certain of its subsidiaries filed a voluntary petition for relief under Chapter 11 of the U.S. Bankruptcy Code. Smurfit-Stone’s Canadian subsidiaries also filed to reorganize in Canada. We believe that matters relating to previously identified third-party PRP sites and certain facilities formerly owned or operated by Smurfit-Stone have been satisfied by claims in the Smurfit-Stone bankruptcy proceedings. However, we may face additional liability for cleanup activity at sites that are not subject to the bankruptcy discharge, but are not currently identified. The final bankruptcy distributions were made in fiscal 2018. See “ Note 17. Commitments and Contingencies Litigation A lawsuit filed in the U.S. District Court of the Northern District of Illinois in 2010 alleges that certain named defendants violated the Sherman Act by conspiring to limit the supply and fix the prices of containerboard and products containing containerboard from February 15, 2004 through November 8, 2010 (the “ Antitrust Litigation $0.1 million. We have been named a defendant in asbestos-related personal injury litigation. To date, the costs resulting from the litigation, including settlement costs, have not been significant. As of March 31, 2019, there were approximately 800 such lawsuits. We believe that we have substantial insurance coverage, subject to applicable deductibles and policy limits, with respect to asbestos claims. We have valid defenses to these asbestos-related personal injury claims and intend to continue to defend them vigorously. Should the volume of litigation grow substantially, it is possible that we could incur significant costs resolving these cases. We do not expect the resolution of pending asbestos litigation and proceedings to have a material adverse effect on our consolidated financial condition or liquidity. In any given period or periods, however, it is possible such proceedings or matters could have a material adverse effect on our results of operations, financial condition or cash flows. We are a defendant in a number of other lawsuits and claims arising out of the conduct of our business. While the ultimate results of such suits or other proceedings against us cannot be predicted with certainty, we believe the resolution of these other matters will not have a material adverse effect on our results of operations, financial condition or cash flows. Guarantees We make certain guarantees in the normal course of conducting our operations, for compliance with certain laws and regulations, or in connection with certain business dispositions. The guarantees include items such as funding of net losses in proportion to our ownership share of certain joint ventures, debt guarantees related to certain unconsolidated entities acquired in acquisitions, indemnifications of lessors in certain facilities and equipment operating leases for items such as additional taxes being assessed due to a change in tax law, and certain other agreements. We estimate our exposure to these matters could be approximately $50 million. As of March 31, 2019, we had recorded $11.8 million for the estimated fair value of these guarantees. We are unable to estimate our maximum exposure under operating leases because it is dependent on potential changes in the tax laws; however, we believe our exposure related to guarantees would not have a material impact on our results of operations, financial condition or cash flows.

Equity and Other Comprehensive

Equity and Other Comprehensive Income (Loss)	6 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Equity and Other Comprehensive Income (Loss)	Note 15. Equity and Other Comprehensive Income (Loss) Equity Stock Repurchase Program In July 2015, our board of directors authorized a repurchase program of up to 40.0 million shares of our common stock, par value $0.01 per share (“ Common Stock The tables below summarize the changes in accumulated other comprehensive loss, net of tax, by component for the six months ended March 31, 2019 and March 31, 2018 (in millions): Cash Flow Hedges Defined Benefit Pension and Postretirement Plans Foreign Currency Items Total (1) Balance at September 30, 2018 $ (0.2 ) $ (465.9 ) $ (229.2 ) $ (695.3 ) Other comprehensive loss before reclassifications — — (39.0 ) (39.0 ) Amounts reclassified from accumulated other comprehensive loss — 8.8 — 8.8 Net current period other comprehensive income (loss) — 8.8 (39.0 ) (30.2 ) Balance at March 31, 2019 $ (0.2 ) $ (457.1 ) $ (268.2 ) $ (725.5 ) (1) Cash Flow Hedges Defined Benefit Pension and Postretirement Plans Foreign Currency Items Available for Sale Security Total (1) Balance at September 30, 2017 $ (0.7 ) $ (462.5 ) $ 5.2 $ 0.7 $ (457.3 ) Other comprehensive (loss) income before reclassifications — (2.8 ) 12.1 0.8 10.1 Amounts reclassified from accumulated other comprehensive loss (income) 0.5 6.5 — (1.5 ) 5.5 Net current period other comprehensive income (loss) 0.5 3.7 12.1 (0.7 ) 15.6 Balance at March 31, 2018 $ (0.2 ) $ (458.8 ) $ 17.3 $ — $ (441.7 ) (1) The net of tax amounts were determined using the jurisdictional statutory rates, and reflect effective tax rates averaging 25% to 26% for the six months ended March 31, 2019 and 27% to 28% for the six months ended March 31, 2018. Although we are impacted by the exchange rates of a number of currencies, foreign currency translation losses recorded in accumulated other comprehensive loss for the six months ended March 31, 2019 were primarily due to losses in the Canadian dollar, Mexican Peso and Euro, partially offset by changes in the Brazilian Real exchange rate, each against the U.S. dollar. Foreign currency translation gains recorded in accumulated other comprehensive loss for the six months ended March 31, 2018 were primarily due to gains in the Euro, British Pound, Chinese Yuan, Mexican Peso, Czech Koruna and Japanese Yen, partially offset by losses in the Brazilian Real and Canadian dollar . The following table summarizes the reclassifications out of accumulated other comprehensive income by component (in millions): Three Months Ended Three Months Ended March 31, 2019 March 31, 2018 Pretax Tax Net of Tax Pretax Tax Net of Tax Amortization of defined benefit pension and postretirement items: (1) Actuarial losses (2) $ (4.1 ) $ 1.1 $ (3.0 ) $ (4.5 ) $ 1.2 $ (3.3 ) Prior service costs (2) (0.6 ) 0.2 (0.4 ) — — — Subtotal defined benefit plans (4.7 ) 1.3 (3.4 ) (4.5 ) 1.2 (3.3 ) Available for sale security (3) — — — 1.5 — 1.5 Total reclassifications for the period $ (4.7 ) $ 1.3 $ (3.4 ) $ (3.0 ) $ 1.2 $ (1.8 ) (1) (2) Note 5. Retirement Plans (3) Six Months Ended Six Months Ended March 31, 2019 March 31, 2018 Pretax Tax Net of Tax Pretax Tax Net of Tax Amortization of defined benefit pension and postretirement items: (1) Actuarial losses (2) $ (10.7 ) $ 2.8 $ (7.9 ) $ (8.9 ) $ 2.4 $ (6.5 ) Prior service costs (2) (1.2 ) 0.3 (0.9 ) — — — Subtotal defined benefit plans (11.9 ) 3.1 (8.8 ) (8.9 ) 2.4 (6.5 ) Available for sale security (3) — — — 1.5 — 1.5 Derivative Instruments: (1) Foreign currency cash flow hedges (4) — — — (0.7 ) 0.2 (0.5 ) Total reclassifications for the period $ (11.9 ) $ 3.1 $ (8.8 ) $ (8.1 ) $ 2.6 $ (5.5 ) (1) (2) Note 5. Retirement Plans (3) (4)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 16. Earnings Per Share The restricted stock awards that we grant to non-employee directors are considered participating securities as they receive non-forfeitable rights to dividends at the same rate as our Common Stock. As participating securities, we include these instruments in the earnings allocation in computing earnings per share under the two-class method described in ASC 260 “ Earnings per Share. Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Numerator: Net income attributable to common stockholders $ 160.4 $ 223.2 $ 299.5 $ 1,358.3 Less: Distributed and undistributed income available to participating securities — — — (0.2 ) Distributed and undistributed income available to common stockholders $ 160.4 $ 223.2 $ 299.5 $ 1,358.1 Denominator: Basic weighted average shares outstanding 256.6 256.1 255.7 255.5 Effect of dilutive stock options and non- participating securities 2.8 4.2 3.7 4.2 Diluted weighted average shares outstanding 259.4 260.3 259.4 259.7 Basic earnings per share attributable to common stockholders $ 0.63 $ 0.87 $ 1.17 $ 5.32 Diluted earnings per share attributable to common stockholders $ 0.62 $ 0.86 $ 1.15 $ 5.23 All shares were included in computing earnings per share in the three months ended March 31, 2018. Approximately 1.6 million awards in the three months ended March 31, 2019 were not included in computing diluted earnings per share because the effect would have been antidilutive. Approximately 1.3 million and 0.1 million awards in the six months ended March 31, 2019 and March 31, 2018, respectively, were not included in computing diluted earnings per share because the effect would have been antidilutive.

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our independent registered public accounting firm has not audited our accompanying interim financial statements. We derived the Condensed Consolidated Balance Sheet at September 30, 2018 from the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018 (the “ Fiscal 2018 Form 10-K On October 1, 2018, we adopted Accounting Standards Update (“ ASU ASC Revenue from Contracts with Customers ASC 606 Note 2. Revenue Recognition We adopted ASU 2017-07, “ Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ” on October 1, 2018 on a retrospective basis. pon the adoption of this ASU, $24.6 million and $49.2 million, respectively, , which was previously reported in “Cost of goods sold” for $10.0 million and $20.0 million, respectively, and “S We adopted the provisions of ASU 2016-15 “ Classification of Certain Cash Receipts and Cash Payments We adopted the provisions of ASU 2016-18, “ Restricted Cash amounts shown on the condensed consolidated statements of cash flows. Due to the minimal amount of restricted cash on our condensed consolidated balance sheets, the impact was not material. We have condensed or omitted certain notes and other information from the interim financial statements presented in this report. Therefore, these interim financial statements should be read in conjunction with our Fiscal 2018 Form 10-K. The results for the three and six months ended March 31, 2019 are not necessarily indicative of results that may be expected for the full year.
Significant Accounting Policies	Significant Accounting Policies See “ Note 1. Description of Business and Summary of Significant Accounting Policies
New Accounting Standards - Recently Adopted	New Accounting Standards - Recently Adopted See “ Note 1. Description of Business and Summary of Significant Accounting Policies — New Accounting Standards - Recently Adopted
New Accounting Standards - Recently Issued	New Accounting Standards - Recently Issued See “ Note 1. Description of Business and Summary of Significant Accounting Policies — New Accounting Standards - Recently Issued In October 2018, the Financial Accounting Standards Board (“ FASB Collaborative Arrangements (Topic 808): Clarifying the Interaction Between Topic 808 and Topic 606 Collaborative arrangements ASC 808 In October 2018, the FASB issued ASU 2018-17 “ Consolidation: Targeted Improvements to Related Party Guidance for Variable Interest Entities GAAP In August 2018, the FASB issued ASU 2018-15 “ Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the FASB issued ASU 2018-14 “ Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans In February 2018, the FASB issued ASU 2018-02, “ Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income U.S. Tax Act Income Statement – Reporting Comprehensive Income” In August 2017, the FASB issued ASU 2017-12, “ Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities In October 2018, the FASB issued ASU 2018-16 “Derivatives and Hedging: Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting ”, which adds the overnight index rate based on the Secured Overnight Financing Rate to the list of U.S. benchmark interest rates in ASC 815 that are eligible to be hedged. In February 2016, the FASB issued ASU 2016-02 “ Leases”, Leases” Leases In December 2018, the FASB issued ASU 2018-20 “ Leases: Narrow-scope Improvements for Lessors ” to help lessors apply ASC 842, which allows lessors to make an accounting policy election not to evaluate sales taxes and other similar taxes collected from lessees, requires lessors to exclude from variable payments certain lessor costs paid directly by lessee to third parties on the lessor’s behalf and provides clarification on variable payments allocated to lease and non-lease components. “Leases (Topic 842): Codification Improvements” “Financial Services—Depository and Lending”

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Schedule of Disaggregate Revenue by Geographical Market and Product Type (Segment)	The tables below disaggregate our revenue by geographical market and product type (segment). Three Months Ended March 31, 2019 (In millions) Corrugated Packaging Consumer Packaging Land and Development Intersegment Sales Total Primary Geographical Markets North America $ 2,865.3 $ 1,308.3 $ 0.8 $ (39.8 ) $ 4,134.6 South America 109.6 17.9 — — 127.5 Europe — 269.6 — — 269.6 Asia Pacific 15.8 72.5 — — 88.3 Total (1) $ 2,990.7 $ 1,668.3 $ 0.8 $ (39.8 ) $ 4,620.0 (1) Net sales are attributed to geographical markets based on the location of the seller. Six Months Ended March 31, 2019 (In millions) Corrugated Packaging Consumer Packaging Land and Development Intersegment Sales Total Primary Geographical Markets North America $ 5,471.7 $ 2,564.7 $ 14.7 $ (77.7 ) $ 7,973.4 South America 218.4 37.4 — — 255.8 Europe — 530.1 — — 530.1 Asia Pacific 34.4 154.9 — (1.2 ) 188.1 Total (1) $ 5,724.5 $ 3,287.1 $ 14.7 $ (78.9 ) $ 8,947.4 (1) Net sales are attributed to geographical markets based on the location of the seller.
Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities	The opening and closing balances of our contract assets and contract liabilities are as follows. Contract assets and contract liabilities are aggregated within Other current assets and Other current liabilities, respectively, on the condensed consolidated balance sheet. (In millions) Contract Assets (Short-Term) Contract Liabilities (Short-Term) Beginning balance - October 1, 2018 $ 183.7 $ 7.9 Impact of acquisition 13.0 — Ending balance - March 31, 2019 194.0 12.4 (Decrease) / increase $ (2.7 ) $ 4.5
ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Financial Statements	The adoption of ASC 606 had the following impact on our condensed consolidated financial statements: Condensed Consolidated Statements of Income Three Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Net sales $ 4,620.0 $ 4,614.6 $ 5.4 Cost of goods sold $ 3,720.4 $ 3,715.5 $ 4.9 Income tax expense $ (47.2 ) $ (47.1 ) $ (0.1 ) Consolidated net income $ 161.9 $ 161.5 $ 0.4 Six Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Net sales $ 8,947.4 $ 8,950.1 $ (2.7 ) Cost of goods sold $ 7,266.0 $ 7,270.1 $ (4.1 ) Income tax expense $ (109.9 ) $ (109.6 ) $ (0.3 ) Consolidated net income $ 301.7 $ 300.6 $ 1.1 Condensed Consolidated Balance Sheet March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Inventories $ 2,096.9 $ 2,237.9 $ (141.0 ) Other current assets $ 562.4 $ 368.4 $ 194.0 Other current liabilities $ 541.6 $ 541.3 $ 0.3 Retained earnings $ 1,671.2 $ 1,626.6 $ 44.6 Condensed Consolidated Statement of Cash Flows Six Months Ended March 31, 2019 (In millions) As Reported Balances Without Adoption of ASC 606 Impact of Adoption Increase/(Decrease) Consolidated net income $ 301.7 $ 300.6 $ 1.1 Other assets $ (128.9 ) $ (131.6 ) $ 2.7 Inventories $ (67.5 ) $ (63.4 ) $ (4.1 ) Income taxes $ (27.0 ) $ (27.3 ) $ 0.3

Acquisitions (Tables)

Acquisitions (Tables) - KapStone Acquisition [Member]	6 Months Ended
	Mar. 31, 2019
Acquired Finite Lived Intangible Assets [Line Items]
Summary of Fair Values of Assets Acquired and Liabilities Assumed by Major of assets and Liabilities and Measurement Period Adjustments	The following table summarizes the fair values of the assets acquired and liabilities assumed by major class of assets and liabilities as of the acquisition date, as well as adjustments made during fiscal 2019 (referred to as “measurement period adjustments”) (in millions): Amounts Recognized as of the Acquisition Date Measurement Period Adjustments (1) Amounts Recognized as of Acquisition Date (as Adjusted) (2) Cash and cash equivalents $ 8.6 $ — $ 8.6 Current assets, excluding cash and cash equivalents 878.9 (22.0 ) 856.9 Property, plant and equipment, net 1,910.3 12.7 1,923.0 Goodwill 1,755.0 (23.1 ) 1,731.9 Intangible assets 1,336.1 25.3 1,361.4 Other long-term assets 27.9 0.2 28.1 Total assets acquired 5,916.8 (6.9 ) 5,909.9 Current portion of debt 33.3 — 33.3 Current liabilities 337.5 2.3 339.8 Long-term debt due after one year 1,333.4 — 1,333.4 Accrued pension and other long-term benefits 9.8 1.5 11.3 Deferred income taxes 609.7 (13.6 ) 596.1 Other long-term liabilities 118.4 2.9 121.3 Total liabilities assumed 2,442.1 (6.9 ) 2,435.2 Net assets acquired $ 3,474.7 $ — $ 3,474.7 (1) The measurement period adjustments recorded in fiscal 2019 did not have a significant impact on our condensed consolidated statements of income for the three and six months ended March 31, 2019. (2) The measurement period adjustments were primarily due to refinements to third party appraisals and carrying amounts of certain assets and liabilities, as well as adjustments to certain tax accounts based on, among other things, adjustments to deferred tax liabilities. The net impact of the measurement period adjustments resulted in a net decrease to goodwill.
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The following table summarizes the weighted average life and the fair value of intangible assets recognized in the KapStone Acquisition, excluding goodwill (in millions): Weighted Avg. Life Gross Carrying Amount Customer relationships 11.6 $ 1,297.0 Trademarks and tradenames 17.0 55.2 Favorable contracts 5.9 9.2 Total 11.8 $ 1,361.4

Restructuring and Other Costs (

Restructuring and Other Costs (Tables)	6 Months Ended
	Mar. 31, 2019
Restructuring And Other Costs [Abstract]
Schedule of Restructuring and Other Costs	The following table summarizes our Restructuring and other costs (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Restructuring $ 24.3 $ 21.2 $ 50.0 $ 25.6 Other 10.5 10.5 39.2 22.4 Restructuring and other costs $ 34.8 $ 31.7 $ 89.2 $ 48.0
Schedule of Restructuring Charges Related to Active Restructuring Initiatives	The following table presents a summary of restructuring charges related to active restructuring initiatives that we incurred during the three and six months ended March 31, 2019 and 2018, the cumulative recorded amount since we started the initiatives and our estimate of the total costs we expect to incur (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Cumulative Total Expected Corrugated Packaging Net property, plant and equipment costs $ 4.0 $ 0.3 $ 7.1 $ 0.9 $ 205.2 $ 205.2 Severance and other employee costs 4.1 1.3 10.7 2.4 53.1 53.5 Equipment and inventory relocation costs 1.0 1.6 1.4 3.1 9.1 10.6 Facility carrying costs 0.9 1.0 2.0 1.8 30.7 32.3 Other costs 0.3 0.1 0.3 (0.2 ) 13.4 17.4 Restructuring total $ 10.3 $ 4.3 $ 21.5 $ 8.0 $ 311.5 $ 319.0 Consumer Packaging Net property, plant and equipment costs $ (0.2 ) $ 3.4 $ (0.2 ) $ 4.4 $ 37.8 $ 37.8 Severance and other employee costs 2.9 5.3 2.8 3.4 38.1 38.3 Equipment and inventory relocation costs 0.4 1.1 0.7 1.5 6.0 7.0 Facility carrying costs 0.2 0.2 — 0.6 2.0 2.0 Other costs 2.7 2.4 3.2 2.1 25.3 25.8 Restructuring total $ 6.0 $ 12.4 $ 6.5 $ 12.0 $ 109.2 $ 110.9 Land and Development Net property, plant and equipment costs $ — $ — $ — $ — $ 1.8 $ 1.8 Severance and other employee costs 0.2 0.2 0.1 0.6 13.8 13.8 Other costs — — — — 3.0 3.0 Restructuring total $ 0.2 $ 0.2 $ 0.1 $ 0.6 $ 18.6 $ 18.6 Corporate Net property, plant and equipment costs $ — $ — $ — $ — $ 1.4 $ 1.4 Severance and other employee costs 5.6 (0.1 ) 19.8 0.1 120.5 120.5 Other costs 2.2 4.4 2.1 4.9 17.6 17.6 Restructuring total $ 7.8 $ 4.3 $ 21.9 $ 5.0 $ 139.5 $ 139.5 Total Net property, plant and equipment costs $ 3.8 $ 3.7 $ 6.9 $ 5.3 $ 246.2 $ 246.2 Severance and other employee costs 12.8 6.7 33.4 6.5 225.5 226.1 Equipment and inventory relocation costs 1.4 2.7 2.1 4.6 15.1 17.6 Facility carrying costs 1.1 1.2 2.0 2.4 32.7 34.3 Other costs 5.2 6.9 5.6 6.8 59.3 63.8 Restructuring total $ 24.3 $ 21.2 $ 50.0 $ 25.6 $ 578.8 $ 588.0
Schedule of Acquisition, Divestiture and Integration Costs	The following table presents our acquisition, divestiture and integration costs (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Acquisition costs $ 3.0 $ 5.7 $ 27.0 $ 7.6 Divestiture costs 0.1 (0.1 ) 0.2 0.2 Integration costs 7.4 4.9 12.0 14.6 Other total $ 10.5 $ 10.5 $ 39.2 $ 22.4
Schedule of Changes in Restructuring Accrual and Reconciliation of Accrual Charges	The following table summarizes the changes in the restructuring accrual, which is primarily composed of lease commitments, accrued severance and other employee costs, and presents a reconciliation of the restructuring accrual charges to the line item “ Restructuring and other costs Six Months Ended March 31, 2019 2018 Accrual at beginning of fiscal year $ 31.6 $ 47.4 Additional accruals 32.3 8.0 Payments (24.2 ) (17.7 ) Adjustment to accruals (2.7 ) 1.4 Foreign currency rate changes (0.1 ) (0.3 ) Accrual at March 31 $ 36.9 $ 38.8 Reconciliation of accruals and charges to restructuring and other costs (in millions): Six Months Ended March 31, 2019 2018 Additional accruals and adjustments to accruals (see table above) $ 29.6 $ 9.4 Acquisition costs 27.0 7.6 Integration costs 12.0 14.6 Divestiture costs 0.2 0.2 Net property, plant and equipment 6.9 5.3 Severance and other employee costs 6.3 0.4 Equipment and inventory relocation costs 2.1 4.6 Facility carrying costs 2.0 2.4 Other costs 3.1 3.5 Total restructuring and other costs $ 89.2 $ 48.0

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Mar. 31, 2019
Retirement Plans [Abstract]
Summary of Components of Net Pension (Income) Cost and Summary of Components of Postretirement Benefit Cost	The following table presents a summary of the components of net pension (income) cost (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Service cost $ 11.4 $ 12.5 $ 22.3 $ 24.1 Interest cost 58.7 51.3 115.2 102.2 Expected return on plan assets (85.9 ) (82.5 ) (168.8 ) (164.6 ) Amortization of net actuarial loss 5.4 4.6 12.4 9.2 Amortization of prior service cost 1.3 1.1 2.6 2.2 Curtailment loss 0.9 — 0.9 — Company defined benefit plan income (8.2 ) (13.0 ) (15.4 ) (26.9 ) Multiemployer pension withdrawals — — — 180.0 Multiemployer and other plans 0.1 0.3 0.3 1.1 Net pension (income) cost $ (8.1 ) $ (12.7 ) $ (15.1 ) $ 154.2 Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Service cost $ 0.3 $ 0.4 $ 0.6 $ 0.8 Interest cost 2.0 2.0 3.9 4.0 Amortization of net actuarial gain (0.4 ) (0.1 ) (0.8 ) (0.1 ) Amortization of prior service credit (0.7 ) (1.0 ) (1.4 ) (2.1 ) Net postretirement cost $ 1.2 $ 1.3 $ 2.3 $ 2.6

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Summary of Changes in Reserve for Uncertain Tax Position	The following table sets forth the changes in the reserve for uncertain tax positions during the six months ended March 31, 2019 (in millions): Balance at beginning of fiscal year $ 127.1 Additions related to purchase accounting (1) 1.0 Additions for tax positions taken in current year (2) 102.8 Additions for tax positions taken in prior fiscal years 1.0 Additions for currency translation adjustments 0.6 Reductions as a result of a lapse of the applicable statute of limitations (0.7 ) Balance at March 31, 2019 $ 231.8 (1) Adjustment in fiscal 2019 relates to the KapStone Acquisition. (2) Additions for tax positions taken in current fiscal year includes primarily positions taken related to foreign subsidiaries.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Certain Operating Data for Segments	The following table shows selected operating data for our segments (in millions): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Net sales (aggregate): Corrugated Packaging $ 2,990.7 $ 2,391.3 $ 5,724.5 $ 4,711.0 Consumer Packaging 1,668.3 1,637.3 3,287.1 3,238.6 Land and Development 0.8 26.7 14.7 38.1 Total $ 4,659.8 $ 4,055.3 $ 9,026.3 $ 7,987.7 Less net sales (intersegment): Corrugated Packaging $ 19.4 $ 22.0 $ 37.4 $ 41.4 Consumer Packaging 20.4 16.3 41.5 35.3 Total $ 39.8 $ 38.3 $ 78.9 $ 76.7 Net sales (unaffiliated customers): Corrugated Packaging $ 2,971.3 $ 2,369.3 $ 5,687.1 $ 4,669.6 Consumer Packaging 1,647.9 1,621.0 3,245.6 3,203.3 Land and Development 0.8 26.7 14.7 38.1 Total $ 4,620.0 $ 4,017.0 $ 8,947.4 $ 7,911.0 Segment income: Corrugated Packaging $ 310.3 $ 262.8 $ 557.1 $ 532.7 Consumer Packaging 85.2 94.6 162.1 188.8 Land and Development 0.5 16.1 1.2 15.4 Segment income 396.0 373.5 720.4 736.9 Gain on sale of certain closed facilities — — 50.5 — Multiemployer pension withdrawals — — — (180.0 ) Land and Development impairments (13.0 ) — (13.0 ) (27.6 ) Restructuring and other costs (34.8 ) (31.7 ) (89.2 ) (48.0 ) Non-allocated expenses (24.4 ) (21.4 ) (43.4 ) (37.3 ) Interest expense, net (111.8 ) (78.3 ) (206.2 ) (143.1 ) Gain (loss) on extinguishment of debt 0.4 0.1 (1.5 ) (0.9 ) Other (expense) income, net (3.3 ) 1.1 (6.0 ) 3.6 Income before income taxes $ 209.1 $ 243.3 $ 411.6 $ 303.6 The following table shows selected operating data for our segments (in millions): March 31, 2019 September 30, 2018 Identifiable assets: Corrugated Packaging $ 16,775.2 $ 11,069.6 Consumer Packaging 11,220.3 11,511.1 Land and Development 34.4 49.1 Assets held for sale 33.5 59.5 Corporate 2,629.6 2,671.2 Total $ 30,693.0 $ 25,360.5
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill during the six months ended March 31, 2019 is as follows (in millions): Corrugated Packaging Consumer Packaging Total Balance as of September 30, 2018 Goodwill $ 1,966.8 $ 3,653.6 $ 5,620.4 Accumulated impairment losses (0.1 ) (42.7 ) (42.8 ) 1,966.7 3,610.9 5,577.6 Goodwill acquired 1,735.0 — 1,735.0 Purchase price allocation adjustments 0.9 (0.6 ) 0.3 Translation adjustments 2.8 (14.8 ) (12.0 ) Balance as of March 31, 2019 Goodwill 3,705.5 3,638.2 7,343.7 Accumulated impairment losses (0.1 ) (42.7 ) (42.8 ) $ 3,705.4 $ 3,595.5 $ 7,300.9

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	March 31, 2019 September 30, 2018 Finished goods and work in process $ 956.5 $ 867.0 Raw materials 844.0 730.0 Spare parts and supplies 460.8 368.2 Inventories at FIFO cost 2,261.3 1,965.2 LIFO reserve (164.4 ) (135.6 ) Net inventories $ 2,096.9 $ 1,829.6

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Mar. 31, 2019
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	The components of property, plant and equipment were as follows (in millions): March 31, 2019 September 30, 2018 Property, plant and equipment at cost: Land and buildings $ 2,360.9 $ 2,078.9 Machinery and equipment 14,206.1 12,064.0 Forestlands and mineral rights 149.9 158.0 Transportation equipment 31.0 30.1 Leasehold improvements 100.2 88.9 16,848.1 14,419.9 Less: accumulated depreciation, depletion and amortization (5,818.7 ) (5,337.4 ) Property, plant and equipment, net $ 11,029.4 $ 9,082.5

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Summary of Activity Under A/R Sales Agreement	The following table presents a summary of the activity under the A/R Sales Agreement and the Prior A/R Sales Agreement for the six months ended March 31, 2019 and March 31, 2018 (in millions): Six Months Ended March 31, 2019 2018 Receivable from financial institution at beginning of fiscal year $ — $ 24.9 Receivables sold to the financial institution and derecognized 943.0 790.2 Receivables collected by financial institution (956.4 ) (783.3 ) Cash paid to (proceeds from) financial institution 13.4 (10.0 ) Receivable $ — $ 21.8

Debt (Tables)

Debt (Tables)	6 Months Ended
	Mar. 31, 2019
Debt [Abstract]
Schedule of Carrying Value of Individual Components of Debt	The following table shows the carrying value of the individual components of our debt (in millions): March 31, 2019 September 30, 2018 Public bonds due fiscal 2019 to 2022 $ 1,114.1 $ 1,470.9 Public bonds due fiscal 2023 to 2028 3,271.3 2,534.4 Public bonds due fiscal 2029 to 2033 1,707.8 964.1 Public bonds due fiscal 2037 to 2047 179.1 178.5 Term loan facilities 2,905.8 599.4 Revolving credit and swing facilities 527.2 355.0 Receivables-backed financing facility 150.0 — Commercial paper 588.3 — Capital lease obligations 189.0 171.0 Supplier financing and commercial card programs 130.1 105.1 International and other debt 32.8 36.8 Total debt 10,795.5 6,415.2 Less: current portion of debt 1,422.4 740.7 Long-term debt due after one year $ 9,373.1 $ 5,674.5
Schedule of aggregate maturities of debt	As of , the aggregate maturities of debt, excluding capital lease obligations, for the remainder of the current fiscal year and the succeeding four fiscal years and thereafter were as follows (in millions): Remaining fiscal 2019 $ 1,056.6 Fiscal 2020 468.2 Fiscal 2021 352.7 Fiscal 2022 2,251.8 Fiscal 2023 527.7 Thereafter 5,766.6 Fair value of debt step-up, deferred financing costs and unamortized bond discounts 182.9 Total $ 10,606.5 As of March 31, 2019 Remaining fiscal 2019 $ 3.5 Fiscal 2020 6.1 Fiscal 2021 4.3 Fiscal 2022 3.5 Fiscal 2023 1.9 Thereafter 151.8 Fair value of debt step-up, deferred financing costs and unamortized bond discounts 17.9 Total $ 189.0

Selected Condensed Consolidat_2

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors (Tables)	6 Months Ended
	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Condensed Consolidating Statements of Operations	CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 639.2 $ 4,638.1 $ (657.3 ) $ 4,620.0 Cost of goods sold — — 526.8 3,850.9 (657.3 ) 3,720.4 Selling, general and administrative, excluding intangible amortization — 0.3 14.2 429.6 — 444.1 Selling, general and administrative intangible amortization — — 26.3 76.1 — 102.4 Land and Development impairments — — — 13.0 — 13.0 Restructuring and other costs — 3.9 — 30.9 — 34.8 Operating profit (loss) — (4.2 ) 71.9 237.6 — 305.3 Interest expense, net — (65.0 ) (42.0 ) (4.8 ) — (111.8 ) Intercompany interest income (expense), net — 0.5 (27.5 ) 27.0 — — Gain on extinguishment of debt — — 0.4 — — 0.4 Pension and other postretirement non- service (expense) income — — (1.7 ) 20.4 — 18.7 Other (expense) income, net — (3.4 ) (1.0 ) 1.1 — (3.3 ) Equity in income of unconsolidated entities — — — (0.2 ) — (0.2 ) Equity in income of consolidated entities 160.4 196.9 168.8 — (526.1 ) — Income before income taxes 160.4 124.8 168.9 281.1 (526.1 ) 209.1 Income tax benefit (expense) — 14.1 0.6 (61.9 ) — (47.2 ) Consolidated net income 160.4 138.9 169.5 219.2 (526.1 ) 161.9 Less: Net income attributable to noncontrolling interests — — — (1.5 ) — (1.5 ) Net income attributable to common stockholders $ 160.4 $ 138.9 $ 169.5 $ 217.7 $ (526.1 ) $ 160.4 Comprehensive income attributable to common stockholders $ 189.7 $ 168.3 $ 201.6 $ 247.0 $ (616.9 ) $ 189.7 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 1,263.0 $ 8,971.9 $ (1,287.5 ) $ 8,947.4 Cost of goods sold — — 1,027.7 7,525.8 (1,287.5 ) 7,266.0 Selling, general and administrative, excluding intangible amortization — 0.4 27.3 817.3 — 845.0 Selling, general and administrative intangible amortization — — 52.3 143.0 — 195.3 Gain on disposal of assets — — — (43.8 ) — (43.8 ) Land and Development impairments — — — 13.0 — 13.0 Restructuring and other costs — 3.9 0.1 85.2 — 89.2 Operating profit (loss) — (4.3 ) 155.6 431.4 — 582.7 Interest expense, net — (112.0 ) (91.9 ) (2.3 ) — (206.2 ) Intercompany interest income (expense), net — 3.5 (54.6 ) 51.1 — — (Loss) gain on extinguishment of debt — (1.8 ) 0.4 (0.1 ) — (1.5 ) Pension and other postretirement non- service (expense) income — — (3.4 ) 39.4 — 36.0 Other expense, net — (4.0 ) (0.4 ) (1.6 ) — (6.0 ) Equity in income of unconsolidated entities — — — 6.6 — 6.6 Equity in income of consolidated entities 299.5 396.7 417.3 — (1,113.5 ) — Income before income taxes 299.5 278.1 423.0 524.5 (1,113.5 ) 411.6 Income tax benefit (expense) — 29.0 (1.3 ) (137.6 ) — (109.9 ) Consolidated net income 299.5 307.1 421.7 386.9 (1,113.5 ) 301.7 Less: Net income attributable to noncontrolling interests — — — (2.2 ) — (2.2 ) Net income attributable to common stockholders $ 299.5 $ 307.1 $ 421.7 $ 384.7 $ (1,113.5 ) $ 299.5 Comprehensive income attributable to common stockholders $ 269.3 $ 277.1 $ 394.5 $ 354.7 $ (1,026.3 ) $ 269.3 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 633.7 $ 4,034.3 $ (651.0 ) $ 4,017.0 Cost of goods sold — — 512.1 3,366.5 (651.0 ) 3,227.6 Selling, general and administrative, excluding intangible amortization — 0.4 24.9 370.5 — 395.8 Selling, general and administrative intangible amortization — — 26.1 49.1 — 75.2 Loss on disposal of assets — — 0.1 2.7 — 2.8 Restructuring and other costs — 2.5 4.2 25.0 — 31.7 Operating profit (loss) — (2.9 ) 66.3 220.5 — 283.9 Interest expense, net (0.1 ) (28.6 ) (43.5 ) (6.1 ) — (78.3 ) Intercompany interest income (expense), net — 6.2 (16.5 ) 10.3 — — (Loss) gain on extinguishment of debt — (0.7 ) 0.9 (0.1 ) — 0.1 Pension and other postretirement non- service (expense) income — — (0.2 ) 24.8 — 24.6 Other income (expense), net — 0.6 2.6 (2.1 ) — 1.1 Equity in income of unconsolidated entities — — — 11.9 — 11.9 Equity in income of consolidated entities — 242.4 129.5 — (371.9 ) — Income (loss) before income taxes (0.1 ) 217.0 139.1 259.2 (371.9 ) 243.3 Income tax benefit (expense) — 6.3 (0.1 ) (25.0 ) — (18.8 ) Consolidated net income (loss) (0.1 ) 223.3 139.0 234.2 (371.9 ) 224.5 Less: Net income attributable to noncontrolling interests — — — (1.3 ) — (1.3 ) Net income (loss) attributable to common stockholders $ (0.1 ) $ 223.3 $ 139.0 $ 232.9 $ (371.9 ) $ 223.2 Comprehensive income (loss) attributable to common stockholders $ (0.1 ) $ 279.2 $ 213.9 $ 288.8 $ (502.7 ) $ 279.1 CONDENSED CONSOLIDATING STATEMENTS OF INCOME Six Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Net sales $ — $ — $ 1,243.8 $ 7,958.0 $ (1,290.8 ) $ 7,911.0 Cost of goods sold — — 959.6 6,679.3 (1,290.8 ) 6,348.1 Selling, general and administrative, excluding intangible amortization — 0.4 49.3 726.9 — 776.6 Selling, general and administrative intangible amortization — — 52.1 95.6 — 147.7 Loss on disposal of assets — — 0.1 3.8 — 3.9 Multiemployer pension withdrawal — 6.5 12.5 161.0 — 180.0 Land and Development impairments — — — 27.6 — 27.6 Restructuring and other costs — 3.3 5.3 39.4 — 48.0 Operating profit (loss) — (10.2 ) 164.9 224.4 — 379.1 Interest expense, net (0.1 ) (43.9 ) (87.7 ) (11.4 ) — (143.1 ) Intercompany interest income (expense), net — 11.8 (32.3 ) 20.5 — — (Loss) gain on extinguishment of debt — (1.6 ) 0.9 (0.2 ) — (0.9 ) Pension and other postretirement non- service (expense) income — — (0.3 ) 49.5 — 49.2 Other income (expense), net — 1.0 4.3 (1.7 ) — 3.6 Equity in income of unconsolidated entities — — 2.5 13.2 — 15.7 Equity in income of consolidated entities — 1,394.4 1,023.1 — (2,417.5 ) — Income (loss) before income taxes (0.1 ) 1,351.5 1,075.4 294.3 (2,417.5 ) 303.6 Income tax benefit — 6.9 124.4 923.1 — 1,054.4 Consolidated net income (loss) (0.1 ) 1,358.4 1,199.8 1,217.4 (2,417.5 ) 1,358.0 Less: Net loss attributable to noncontrolling interests — — — 0.3 — 0.3 Net income (loss) attributable to common stockholders $ (0.1 ) $ 1,358.4 $ 1,199.8 $ 1,217.7 $ (2,417.5 ) $ 1,358.3 Comprehensive income (loss) attributable to common stockholders $ (0.1 ) $ 1,374.0 $ 1,229.5 $ 1,233.6 $ (2,463.1 ) $ 1,373.9
Condensed Consolidating Balance Sheets	CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 19.6 $ 134.6 $ — $ 154.2 Accounts receivable — — 182.8 2,217.5 (33.3 ) 2,367.0 Inventories — — 254.8 1,842.1 — 2,096.9 Other current assets 0.5 0.7 8.2 553.0 — 562.4 Intercompany receivables — 154.0 23.0 485.6 (662.6 ) — Assets held for sale — — — 33.5 — 33.5 Total current assets 0.5 154.7 488.4 5,266.3 (695.9 ) 5,214.0 Property, plant and equipment, net — — 22.2 11,007.2 — 11,029.4 Goodwill — — 1,151.3 6,149.6 — 7,300.9 Intangibles, net — — 1,537.1 2,740.8 — 4,277.9 Restricted assets held by special purpose entities — — — 1,277.7 — 1,277.7 Prepaid pension asset — — — 447.7 — 447.7 Intercompany notes receivable — 155.0 31.9 2,941.1 (3,128.0 ) — Investments in consolidated subsidiaries 11,797.4 18,075.3 19,938.9 — (49,811.6 ) — Other assets — 14.2 181.4 959.4 (9.6 ) 1,145.4 Total Assets $ 11,797.9 $ 18,399.2 $ 23,351.2 $ 30,789.8 $ (53,645.1 ) $ 30,693.0 LIABILITIES AND EQUITY Current liabilities: Current portion of debt $ — $ 405.6 $ 603.8 $ 413.0 $ — $ 1,422.4 Accounts payable — 1.1 34.7 1,699.5 (33.3 ) 1,702.0 Accrued compensation and benefits 0.1 — 10.2 370.3 — 380.6 Other current liabilities — 7.3 99.1 435.2 — 541.6 Intercompany payables 157.0 504.5 0.8 0.3 (662.6 ) — Total current liabilities 157.1 918.5 748.6 2,918.3 (695.9 ) 4,046.6 Long-term debt due after one year — 6,223.9 2,101.7 1,047.5 — 9,373.1 Intercompany notes payable — — 2,941.1 186.9 (3,128.0 ) — Pension liabilities, net of current portion — — 135.4 115.6 — 251.0 Postretirement benefit liabilities, net of current portion — — 28.0 113.5 — 141.5 Non-recourse liabilities held by special purpose entities — — — 1,149.5 — 1,149.5 Deferred income taxes — — 267.3 2,697.5 (9.6 ) 2,955.2 Other long-term liabilities — 14.6 135.7 969.0 — 1,119.3 Redeemable noncontrolling interests — — — 3.2 — 3.2 Total stockholders’ equity 11,640.8 11,242.2 16,993.4 21,576.0 (49,811.6 ) 11,640.8 Noncontrolling interests — — — 12.8 — 12.8 Total equity 11,640.8 11,242.2 16,993.4 21,588.8 (49,811.6 ) 11,653.6 Total Liabilities and Equity $ 11,797.9 $ 18,399.2 $ 23,351.2 $ 30,789.8 $ (53,645.1 ) $ 30,693.0 CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total ASSETS Current Assets: Cash and cash equivalents $ — $ 0.2 $ 490.8 $ 145.8 $ — $ 636.8 Accounts receivable — 0.1 196.5 1,840.2 (26.1 ) 2,010.7 Inventories — — 233.4 1,596.2 — 1,829.6 Other current assets — 0.4 17.2 230.9 — 248.5 Intercompany receivables — 27.7 269.8 792.8 (1,090.3 ) — Assets held for sale — — — 59.5 — 59.5 Total current assets — 28.4 1,207.7 4,665.4 (1,116.4 ) 4,785.1 Property, plant and equipment, net — — 21.3 9,061.2 — 9,082.5 Goodwill — — 1,151.3 4,426.3 — 5,577.6 Intangibles, net — — 1,589.4 1,532.6 — 3,122.0 Restricted assets held by special purpose entities — — — 1,281.0 — 1,281.0 Prepaid pension asset — — — 420.0 — 420.0 Intercompany notes receivable — 884.2 33.1 2,865.4 (3,782.7 ) — Investments in consolidated subsidiaries — 13,260.3 15,066.3 — (28,326.6 ) — Other assets 3.4 12.4 172.8 910.8 (7.1 ) 1,092.3 Total Assets $ 3.4 $ 14,185.3 $ 19,241.9 $ 25,162.7 $ (33,232.8 ) $ 25,360.5 LIABILITIES AND EQUITY Current liabilities: Current portion of debt $ — $ — $ 609.5 $ 131.2 $ — $ 740.7 Accounts payable — 0.8 40.3 1,701.8 (26.1 ) 1,716.8 Accrued compensation and benefits — 0.2 10.7 388.4 — 399.3 Other current liabilities — 3.2 77.7 395.6 — 476.5 Intercompany payables 13.0 506.6 570.4 0.3 (1,090.3 ) — Total current liabilities 13.0 510.8 1,308.6 2,617.3 (1,116.4 ) 3,333.3 Long-term debt due after one year — 2,179.4 2,460.1 1,035.0 — 5,674.5 Intercompany notes payable — — 2,865.4 917.3 (3,782.7 ) — Pension liabilities, net of current portion — — 135.9 125.4 — 261.3 Postretirement benefit liabilities, net of current portion — — 28.1 106.7 — 134.8 Non-recourse liabilities held by special purpose entities — — — 1,153.7 — 1,153.7 Deferred income taxes — — 291.0 2,037.6 (7.1 ) 2,321.5 Other long-term liabilities — 16.1 106.2 872.5 — 994.8 Redeemable noncontrolling interests — — — 4.2 — 4.2 Total stockholders’ equity (9.6 ) 11,479.0 12,046.6 16,280.0 (28,326.6 ) 11,469.4 Noncontrolling interests — — — 13.0 — 13.0 Total equity (9.6 ) 11,479.0 12,046.6 16,293.0 (28,326.6 ) 11,482.4 Total Liabilities and Equity $ 3.4 $ 14,185.3 $ 19,241.9 $ 25,162.7 $ (33,232.8 ) $ 25,360.5
Condensed Consolidating Statements of Cash Flows	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Net cash provided by (used for) operating activities $ 319.1 $ (93.4 ) $ (196.9 ) $ 1,208.6 $ (572.4 ) $ 665.0 Investing activities: Capital expenditures — — (2.4 ) (623.0 ) — (625.4 ) Cash paid related to business combinations, net of cash acquired — — — (3,349.3 ) — (3,349.3 ) Investment in unconsolidated entities equipment — — — (0.2 ) — (0.2 ) Proceeds from sale of property, plant and equipment — — — 105.3 — 105.3 Proceeds from property, plant and equipment insurance settlement — — — 8.8 — 8.8 Intercompany notes issued — — — (75.7 ) 75.7 — Intercompany notes proceeds — 9.2 1.3 3,800.0 (3,810.5 ) — Intercompany capital investment (563.0 ) (563.0 ) — — 1,126.0 — Other — — 8.6 1.6 — 10.2 Net cash (used for) provided by investing activities (563.0 ) (553.8 ) 7.5 (132.5 ) (2,608.8 ) (3,850.6 ) Financing activities: Proceeds from issuance of notes — 1,498.5 — — — 1,498.5 Additions to revolving credit facilities — 67.5 — 104.5 — 172.0 Additions to debt — 3,801.9 — 156.0 — 3,957.9 Repayments of debt — (1,489.7 ) (357.5 ) (1,362.4 ) — (3,209.6 ) Changes in commercial paper, net — 588.3 — — — 588.3 Other financing additions — — — 16.6 — 16.6 Issuances of common stock, net of related minimum tax withholdings 3.2 — — — — 3.2 Purchases of common stock (88.6 ) — — — — (88.6 ) Cash dividends paid to stockholders (233.7 ) — — — — (233.7 ) Cash distributions paid to noncontrolling interests — — — (2.8 ) — (2.8 ) Intercompany notes borrowing — — 75.7 — (75.7 ) — Intercompany notes payments — (3,800.0 ) — (10.5 ) 3,810.5 — Intercompany capital receipt 563.0 — — 563.0 (1,126.0 ) — Intercompany dividends — — — (572.4 ) 572.4 — Other — (19.5 ) — 22.5 — 3.0 Net cash provided by (used for) financing activities 243.9 647.0 (281.8 ) (1,085.5 ) 3,181.2 2,704.8 Effect of exchange rate changes on cash, cash equivalents and restricted cash — — — (1.8 ) — (1.8 ) Decrease in cash, cash equivalents and restricted cash — (0.2 ) (471.2 ) (11.2 ) — (482.6 ) Cash, cash equivalents and restricted cash at beginning of period — 0.2 490.8 145.8 — 636.8 Cash, cash equivalents and restricted cash at end of period $ — $ 0.0 $ 19.6 $ 134.6 $ — $ 154.2 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Six Months Ended March 31, 2018 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Net cash provided by (used for) operating activities $ 4.0 $ (488.3 ) $ (268.8 ) $ 1,541.0 $ (314.2 ) $ 473.7 Investing activities: Capital expenditures — — (0.4 ) (426.3 ) — (426.7 ) Cash paid related to business combinations, net of cash acquired — — — (185.2 ) — (185.2 ) Cash receipts on sold trade receivables — — — 253.1 — 253.1 Investment in unconsolidated entities — — — (111.0 ) — (111.0 ) Proceeds from sale of property, plant and equipment — — — 15.7 — 15.7 Proceeds from property, plant and equipment insurance settlement — — — 4.8 — 4.8 Intercompany notes issued — — (1.4 ) (375.9 ) 377.3 — Intercompany notes proceeds — — 3.2 83.0 (86.2 ) — Intercompany capital investment — (755.3 ) (300.8 ) — 1,056.1 — Intercompany return of capital — 1,356.3 821.0 — (2,177.3 ) — Other — — 6.6 1.6 — 8.2 Net cash provided by (used for) investing activities — 601.0 528.2 (740.2 ) (830.1 ) (441.1 ) Financing activities: Proceeds from issuance of notes — 1,197.3 — — — 1,197.3 (Repayments) additions to revolving credit facilities — (59.8 ) — 154.1 — 94.3 Additions to debt — 2.7 — 850.5 — 853.2 Repayments of debt — (1,025.2 ) (14.8 ) (970.4 ) — (2,010.4 ) Changes in commercial paper, net — 63.3 — — — 63.3 Other financing repayments — — (5.9 ) (18.6 ) — (24.5 ) Issuances of common stock, net of related minimum tax withholdings — 17.4 — — — 17.4 Cash dividends paid to stockholders — (219.4 ) — — — (219.4 ) Cash distributions paid to noncontrolling interests — — — (8.6 ) — (8.6 ) Intercompany notes borrowing — — 375.9 1.4 (377.3 ) — Intercompany notes payments — (69.0 ) (14.0 ) (3.2 ) 86.2 — Intercompany capital receipt — — 736.9 319.2 (1,056.1 ) — Intercompany capital distribution — — (1,356.3 ) (821.0 ) 2,177.3 — Intercompany dividends — — — (314.2 ) 314.2 — Other (4.0 ) (20.0 ) — (0.9 ) — (24.9 ) Net cash used for financing activities (4.0 ) (112.7 ) (278.2 ) (811.7 ) 1,144.3 (62.3 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash — — (0.1 ) (1.8 ) — (1.9 ) Decrease in cash, cash equivalents and restricted cash — — (18.9 ) (12.7 ) — (31.6 ) Cash, cash equivalents and restricted cash at beginning of period — — 43.3 260.7 — 304.0 Cash, cash equivalents and restricted cash at end of period $ — $ — $ 24.4 $ 248.0 $ — $ 272.4
Summary of Non-Cash Transactions	The table below summarizes these non-cash transactions. Six Months Ended March 31, 2019 (In millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Total Operating activities: Intercompany receivables $ (140.9 ) $ — $ — $ — $ 140.9 $ — Intercompany payables $ — $ — $ — $ 140.9 $ (140.9 ) $ — Investing activities: Intercompany notes issued $ — $ (3,800.0 ) $ (4,519.8 ) $ (8,057.5 ) $ 16,377.3 $ — Intercompany notes proceeds $ — $ 4,519.8 $ 4,519.8 $ 4,257.5 $ (13,297.1 ) $ — Intercompany capital investment $ (10,396.2 ) $ (5,434.8 ) $ (5,983.6 ) $ — $ 21,814.6 $ — Intercompany return of capital $ 563.0 $ 1,478.0 $ 915.0 $ — $ (2,956.0 ) $ — Financing activities: Intercompany notes borrowing $ — $ 3,800.0 $ 457.5 $ 12,119.8 $ (16,377.3 ) $ — Intercompany notes payments $ — $ — $ (457.5 ) $ (12,839.6 ) $ 13,297.1 $ — Intercompany capital receipt $ — $ 10,396.2 $ 4,977.3 $ 6,441.1 $ (21,814.6 ) $ — Intercompany capital distribution $ (563.0 ) $ (563.0 ) $ (457.5 ) $ (1,372.5 ) $ 2,956.0 $ —

Equity and Other Comprehensiv_2

Equity and Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax	The tables below summarize the changes in accumulated other comprehensive loss, net of tax, by component for the six months ended March 31, 2019 and March 31, 2018 (in millions): Cash Flow Hedges Defined Benefit Pension and Postretirement Plans Foreign Currency Items Total (1) Balance at September 30, 2018 $ (0.2 ) $ (465.9 ) $ (229.2 ) $ (695.3 ) Other comprehensive loss before reclassifications — — (39.0 ) (39.0 ) Amounts reclassified from accumulated other comprehensive loss — 8.8 — 8.8 Net current period other comprehensive income (loss) — 8.8 (39.0 ) (30.2 ) Balance at March 31, 2019 $ (0.2 ) $ (457.1 ) $ (268.2 ) $ (725.5 ) (1) Cash Flow Hedges Defined Benefit Pension and Postretirement Plans Foreign Currency Items Available for Sale Security Total (1) Balance at September 30, 2017 $ (0.7 ) $ (462.5 ) $ 5.2 $ 0.7 $ (457.3 ) Other comprehensive (loss) income before reclassifications — (2.8 ) 12.1 0.8 10.1 Amounts reclassified from accumulated other comprehensive loss (income) 0.5 6.5 — (1.5 ) 5.5 Net current period other comprehensive income (loss) 0.5 3.7 12.1 (0.7 ) 15.6 Balance at March 31, 2018 $ (0.2 ) $ (458.8 ) $ 17.3 $ — $ (441.7 ) (1)
Summary of Reclassification out of Accumulated Other Comprehensive Income	The following table summarizes the reclassifications out of accumulated other comprehensive income by component (in millions): Three Months Ended Three Months Ended March 31, 2019 March 31, 2018 Pretax Tax Net of Tax Pretax Tax Net of Tax Amortization of defined benefit pension and postretirement items: (1) Actuarial losses (2) $ (4.1 ) $ 1.1 $ (3.0 ) $ (4.5 ) $ 1.2 $ (3.3 ) Prior service costs (2) (0.6 ) 0.2 (0.4 ) — — — Subtotal defined benefit plans (4.7 ) 1.3 (3.4 ) (4.5 ) 1.2 (3.3 ) Available for sale security (3) — — — 1.5 — 1.5 Total reclassifications for the period $ (4.7 ) $ 1.3 $ (3.4 ) $ (3.0 ) $ 1.2 $ (1.8 ) (1) (2) Note 5. Retirement Plans (3) Six Months Ended Six Months Ended March 31, 2019 March 31, 2018 Pretax Tax Net of Tax Pretax Tax Net of Tax Amortization of defined benefit pension and postretirement items: (1) Actuarial losses (2) $ (10.7 ) $ 2.8 $ (7.9 ) $ (8.9 ) $ 2.4 $ (6.5 ) Prior service costs (2) (1.2 ) 0.3 (0.9 ) — — — Subtotal defined benefit plans (11.9 ) 3.1 (8.8 ) (8.9 ) 2.4 (6.5 ) Available for sale security (3) — — — 1.5 — 1.5 Derivative Instruments: (1) Foreign currency cash flow hedges (4) — — — (0.7 ) 0.2 (0.5 ) Total reclassifications for the period $ (11.9 ) $ 3.1 $ (8.8 ) $ (8.1 ) $ 2.6 $ (5.5 ) (1) (2) Note 5. Retirement Plans (3) (4)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings per share under the two-class method (in millions, except per share data): Three Months Ended Six Months Ended March 31, March 31, 2019 2018 2019 2018 Numerator: Net income attributable to common stockholders $ 160.4 $ 223.2 $ 299.5 $ 1,358.3 Less: Distributed and undistributed income available to participating securities — — — (0.2 ) Distributed and undistributed income available to common stockholders $ 160.4 $ 223.2 $ 299.5 $ 1,358.1 Denominator: Basic weighted average shares outstanding 256.6 256.1 255.7 255.5 Effect of dilutive stock options and non- participating securities 2.8 4.2 3.7 4.2 Diluted weighted average shares outstanding 259.4 260.3 259.4 259.7 Basic earnings per share attributable to common stockholders $ 0.63 $ 0.87 $ 1.17 $ 5.32 Diluted earnings per share attributable to common stockholders $ 0.62 $ 0.86 $ 1.15 $ 5.23

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Pension and other postretirement non-service income	$ 18.7	$ 24.6	$ 36	$ 49.2
Cost of goods sold	3,720.4	3,227.6	7,266	6,348.1
Selling, general and administrative, excluding intangible amortization	$ 444.1	395.8	$ 845	776.6
Accounting Standards Update 2017-07 | Difference Between Guidance In Effect Before And After ASU201707 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Pension and other postretirement non-service income		24.6		49.2
Cost of goods sold		10		20
Selling, general and administrative, excluding intangible amortization		$ 14.6		29.2
ASU 2016-15 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Decrease in cash provided by operating activities				253.1
Increase in cash provided by investing activities				$ 253.1

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales		$ 4,620	$ 4,017	$ 8,947.4	$ 7,911
Cost of goods sold		3,720.4	3,227.6	7,266	6,348.1
Retained earnings		1,671.2		1,671.2		$ 1,573.3
Income tax (expense) benefit		$ (47.2)	$ (18.8)	$ (109.9)	$ 1,054.4
Revenue performance obligation, practical expedient				true
Revenue, performance obligation satisfied at point in time				one year or less
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Capitalized contract cost, amortization period		1 year		1 year
Impact of Adoption Increase/(Decrease) [Member] | ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 183.7	$ 5.4		$ (2.7)
Cost of goods sold	133.4	4.9		(4.1)
Retained earnings	43.5	44.6		44.6
Income tax (expense) benefit	$ (6.8)	$ (0.1)		$ (0.3)

Revenue Recognition - Summary o

Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statements of Income (Details) - USD ($) $ in Millions	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Net sales		$ 4,620	$ 4,017	$ 8,947.4	$ 7,911
Cost of goods sold		3,720.4	3,227.6	7,266	6,348.1
Income tax (expense) benefit		(47.2)	(18.8)	(109.9)	1,054.4
Consolidated net income		161.9	$ 224.5	301.7	$ 1,358
ASC 606 [Member] | Balances Without Adoption of ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Net sales		4,614.6		8,950.1
Cost of goods sold		3,715.5		7,270.1
Income tax (expense) benefit		(47.1)		(109.6)
Consolidated net income		161.5		300.6
ASC 606 [Member] | Impact of Adoption Increase/(Decrease) [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 183.7	5.4		(2.7)
Cost of goods sold	133.4	4.9		(4.1)
Income tax (expense) benefit	$ (6.8)	(0.1)		(0.3)
Consolidated net income		$ 0.4		$ 1.1

Revenue Recognition - Summary_2

Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Oct. 01, 2018	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Inventories	$ 2,096.9		$ 1,829.6
Other current assets	562.4		248.5
Other current liabilities	541.6		476.5
Retained earnings	1,671.2		$ 1,573.3
ASC 606 [Member] | Balances Without Adoption of ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Inventories	2,237.9
Other current assets	368.4
Other current liabilities	541.3
Retained earnings	1,626.6
ASC 606 [Member] | Impact of Adoption Increase/(Decrease) [Member]
Disaggregation Of Revenue [Line Items]
Inventories	(141)
Other current assets	194
Other current liabilities	0.3
Retained earnings	$ 44.6	$ 43.5

Revenue Recognition - Summary_3

Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Consolidated net income	$ 161.9	$ 224.5	$ 301.7	$ 1,358
Other assets			(128.9)	(56)
Inventories			(67.5)	(83)
Income taxes			(27)	$ 94.1
ASC 606 [Member] | Balances Without Adoption of ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net income	161.5		300.6
Other assets			(131.6)
Inventories			(63.4)
Income taxes			(27.3)
ASC 606 [Member] | Impact of Adoption Increase/(Decrease) [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net income	$ 0.4		1.1
Other assets			2.7
Inventories			(4.1)
Income taxes			$ 0.3

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Disaggregate Revenue by Geographical Market and Product Type (Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 4,620	$ 4,017	$ 8,947.4	$ 7,911
Corrugated Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	2,990.7		5,724.5
Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,668.3		3,287.1
Land and Development [Member]
Disaggregation Of Revenue [Line Items]
Net sales	0.8		14.7
Intersegment Sales [Member]
Disaggregation Of Revenue [Line Items]
Net sales	(39.8)	(38.3)	(78.9)	(76.7)
Intersegment Sales [Member] | Corrugated Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	(19.4)	(22)	(37.4)	(41.4)
Intersegment Sales [Member] | Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	(20.4)	$ (16.3)	(41.5)	$ (35.3)
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	4,134.6		7,973.4
North America [Member] | Corrugated Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	2,865.3		5,471.7
North America [Member] | Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,308.3		2,564.7
North America [Member] | Land and Development [Member]
Disaggregation Of Revenue [Line Items]
Net sales	0.8		14.7
North America [Member] | Intersegment Sales [Member]
Disaggregation Of Revenue [Line Items]
Net sales	(39.8)		(77.7)
South America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	127.5		255.8
South America [Member] | Corrugated Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	109.6		218.4
South America [Member] | Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	17.9		37.4
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales	269.6		530.1
Europe [Member] | Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	269.6		530.1
Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Net sales	88.3		188.1
Asia Pacific [Member] | Corrugated Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	15.8		34.4
Asia Pacific [Member] | Consumer Packaging [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 72.5		154.9
Asia Pacific [Member] | Intersegment Sales [Member]
Disaggregation Of Revenue [Line Items]
Net sales			$ (1.2)

Revenue Recognition - Summary_4

Revenue Recognition - Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities (Details) $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)
Revenue Recognition [Line Items]
Short-Term Contract Assets, Beginning balance	$ 183.7
(Decrerase) / Increase in Short-Term Contract Assets, Impact of Acquisition	(2.7)
Short-Term Contract Assets, Ending balance	194
Short-Term Contract Liabilities, Beginning balance	7.9
Short-Term Contract Liabilities, Ending balance	12.4
(Decrease) / increase in Short-Term Contract Liabilities	4.5
KapStone Acquisition [Member]
Revenue Recognition [Line Items]
(Decrerase) / Increase in Short-Term Contract Assets, Impact of Acquisition	$ 13

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 02, 2018	Mar. 31, 2019	Sep. 30, 2018	Jul. 01, 2015
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Number of WRKCo Shares to WestRock Shares	1
WRKCo Inc. [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01
KapStone Acquisition [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share	0.0001
Business Acquisition, Share Price	$ 35
Ratio of KapStone Shares to WestRock Shares	49.81%
Maximum percentage of issued and outstanding KapStone Shares to elect WestRock stock consideration	25.00%
Estimated Enterprise Value of Acquisition	$ 4,900
Consideration paid in cash	$ 3,300
Business acquisition, number of shares issued	1,600,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 70.1
Business acquisition, percentage of equity interest on shares issued and outsanding	0.60%
Fair value of share-based awards issued in business combinations	$ 70.8

Acquisitions - Summary of Fair

Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed by Major of assets and Liabilities and Measurement Period Adjustments (Details) - USD ($) $ in Millions		Mar. 31, 2019	Nov. 02, 2018	Sep. 30, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 7,300.9		$ 5,577.6
Total assets acquired		5,912.4			$ 228
Liabilities assumed		$ 2,437.9			$ 14.3
KapStone Acquisition [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 8.6
Current assets, excluding cash and cash equivalents			878.9
Property, plant and equipment, net			1,910.3
Goodwill			1,755
Intangible assets			1,336.1
Other long-term assets			27.9
Total assets acquired			5,916.8
Current portion of debt			33.3
Current liabilities			337.5
Long-term debt due after one year			1,333.4
Accrued pension and other long-term benefits			9.8
Deferred income taxes			609.7
Other long-term liabilities			118.4
Liabilities assumed			2,442.1
Net assets acquired			3,474.7
KapStone Acquisition [Member] | Measurement Period Adjustments [Member]
Business Acquisition [Line Items]
Current assets, excluding cash and cash equivalents	[1]		(22)
Property, plant and equipment, net	[1]		12.7
Goodwill	[1]		(23.1)
Intangible assets	[1]		25.3
Other long-term assets	[1]		0.2
Total assets acquired	[1]		(6.9)
Current liabilities	[1]		2.3
Accrued pension and other long-term benefits	[1]		1.5
Deferred income taxes	[1]		(13.6)
Other long-term liabilities	[1]		2.9
Liabilities assumed	[1]		(6.9)
KapStone Acquisition [Member] | As Adjusted [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	[2]		8.6
Current assets, excluding cash and cash equivalents	[2]		856.9
Property, plant and equipment, net	[2]		1,923
Goodwill	[2]		1,731.9
Intangible assets	[2]		1,361.4
Other long-term assets	[2]		28.1
Total assets acquired	[2]		5,909.9
Current portion of debt	[2]		33.3
Current liabilities	[2]		339.8
Long-term debt due after one year	[2]		1,333.4
Accrued pension and other long-term benefits	[2]		11.3
Deferred income taxes	[2]		596.1
Other long-term liabilities	[2]		121.3
Liabilities assumed	[2]		2,435.2
Net assets acquired	[2]		$ 3,474.7
[1]	The measurement period adjustments recorded in fiscal 2019 did not have a significant impact on our condensed consolidated statements of income for the three and six months ended March 31, 2019.
[2]	The measurement period adjustments were primarily due to refinements to third party appraisals and carrying amounts of certain assets and liabilities, as well as adjustments to certain tax accounts based on, among other things, adjustments to deferred tax liabilities. The net impact of the measurement period adjustments resulted in a net decrease to goodwill.

Acquisitions - Summary of Weigh

Acquisitions - Summary of Weighted Average Life and Fair Value of Intangible Asset Recognized in KapStone Acquisition, Excluding Goodwill (Details) - KapStone Acquisition [Member] $ in Millions	Nov. 02, 2018USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	11 years 9 months 18 days
Gross Carrying Amount	$ 1,361.4
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	11 years 7 months 6 days
Gross Carrying Amount	$ 1,297
Trademarks and Tradenames [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	17 years
Gross Carrying Amount	$ 55.2
Favorable Contracts [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life	5 years 10 months 24 days
Gross Carrying Amount	$ 9.2

Restructuring and Other Costs -

Restructuring and Other Costs - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring And Related Activities [Abstract]
Restructuring and other costs	$ 34.8	$ 31.7	$ 89.2	$ 48

Restructuring and Other Costs_2

Restructuring and Other Costs - Schedule of Restructuring and Other Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring And Related Activities [Abstract]
Restructuring	$ 24.3	$ 21.2	$ 50	$ 25.6
Other	10.5	10.5	39.2	22.4
Restructuring and other costs	$ 34.8	$ 31.7	$ 89.2	$ 48

Restructuring and Other Costs_3

Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 24.3	$ 21.2	$ 50	$ 25.6
Restructuring and Related Cost, Cost Incurred to Date	578.8		578.8
Restructuring and Related Cost, Expected Cost	588		588
Net Property, Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	3.8	3.7	6.9	5.3
Restructuring and Related Cost, Cost Incurred to Date	246.2		246.2
Restructuring and Related Cost, Expected Cost	246.2		246.2
Severance and Other Employee Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	12.8	6.7	33.4	6.5
Restructuring and Related Cost, Cost Incurred to Date	225.5		225.5
Restructuring and Related Cost, Expected Cost	226.1		226.1
Equipment and Inventory Relocation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1.4	2.7	2.1	4.6
Restructuring and Related Cost, Cost Incurred to Date	15.1		15.1
Restructuring and Related Cost, Expected Cost	17.6		17.6
Facility Carrying Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1.1	1.2	2	2.4
Restructuring and Related Cost, Cost Incurred to Date	32.7		32.7
Restructuring and Related Cost, Expected Cost	34.3		34.3
Other Costs Related to Restructuring and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	5.2	6.9	5.6	6.8
Restructuring and Related Cost, Cost Incurred to Date	59.3		59.3
Restructuring and Related Cost, Expected Cost	63.8		63.8
Corporate, Non-Segment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	7.8	4.3	21.9	5
Restructuring and Related Cost, Cost Incurred to Date	139.5		139.5
Restructuring and Related Cost, Expected Cost	139.5		139.5
Corporate, Non-Segment [Member] | Net Property, Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1.4		1.4
Restructuring and Related Cost, Expected Cost	1.4		1.4
Corporate, Non-Segment [Member] | Severance and Other Employee Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	5.6	(0.1)	19.8	0.1
Restructuring and Related Cost, Cost Incurred to Date	120.5		120.5
Restructuring and Related Cost, Expected Cost	120.5		120.5
Corporate, Non-Segment [Member] | Other Costs Related to Restructuring and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2.2	4.4	2.1	4.9
Restructuring and Related Cost, Cost Incurred to Date	17.6		17.6
Restructuring and Related Cost, Expected Cost	17.6		17.6
Corrugated Packaging [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	10.3	4.3	21.5	8
Restructuring and Related Cost, Cost Incurred to Date	311.5		311.5
Restructuring and Related Cost, Expected Cost	319		319
Corrugated Packaging [Member] | Net Property, Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	4	0.3	7.1	0.9
Restructuring and Related Cost, Cost Incurred to Date	205.2		205.2
Restructuring and Related Cost, Expected Cost	205.2		205.2
Corrugated Packaging [Member] | Severance and Other Employee Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	4.1	1.3	10.7	2.4
Restructuring and Related Cost, Cost Incurred to Date	53.1		53.1
Restructuring and Related Cost, Expected Cost	53.5		53.5
Corrugated Packaging [Member] | Equipment and Inventory Relocation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1	1.6	1.4	3.1
Restructuring and Related Cost, Cost Incurred to Date	9.1		9.1
Restructuring and Related Cost, Expected Cost	10.6		10.6
Corrugated Packaging [Member] | Facility Carrying Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.9	1	2	1.8
Restructuring and Related Cost, Cost Incurred to Date	30.7		30.7
Restructuring and Related Cost, Expected Cost	32.3		32.3
Corrugated Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.3	0.1	0.3	(0.2)
Restructuring and Related Cost, Cost Incurred to Date	13.4		13.4
Restructuring and Related Cost, Expected Cost	17.4		17.4
Consumer Packaging [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	6	12.4	6.5	12
Restructuring and Related Cost, Cost Incurred to Date	109.2		109.2
Restructuring and Related Cost, Expected Cost	110.9		110.9
Consumer Packaging [Member] | Net Property, Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	(0.2)	3.4	(0.2)	4.4
Restructuring and Related Cost, Cost Incurred to Date	37.8		37.8
Restructuring and Related Cost, Expected Cost	37.8		37.8
Consumer Packaging [Member] | Severance and Other Employee Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2.9	5.3	2.8	3.4
Restructuring and Related Cost, Cost Incurred to Date	38.1		38.1
Restructuring and Related Cost, Expected Cost	38.3		38.3
Consumer Packaging [Member] | Equipment and Inventory Relocation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.4	1.1	0.7	1.5
Restructuring and Related Cost, Cost Incurred to Date	6		6
Restructuring and Related Cost, Expected Cost	7		7
Consumer Packaging [Member] | Facility Carrying Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.2	0.2		0.6
Restructuring and Related Cost, Cost Incurred to Date	2		2
Restructuring and Related Cost, Expected Cost	2		2
Consumer Packaging [Member] | Other Costs Related to Restructuring and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2.7	2.4	3.2	2.1
Restructuring and Related Cost, Cost Incurred to Date	25.3		25.3
Restructuring and Related Cost, Expected Cost	25.8		25.8
Land and Development [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.2	0.2	0.1	0.6
Restructuring and Related Cost, Cost Incurred to Date	18.6		18.6
Restructuring and Related Cost, Expected Cost	18.6		18.6
Land and Development [Member] | Net Property, Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1.8		1.8
Restructuring and Related Cost, Expected Cost	1.8		1.8
Land and Development [Member] | Severance and Other Employee Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.2	$ 0.2	0.1	$ 0.6
Restructuring and Related Cost, Cost Incurred to Date	13.8		13.8
Restructuring and Related Cost, Expected Cost	13.8		13.8
Land and Development [Member] | Other Costs Related to Restructuring and Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	3		3
Restructuring and Related Cost, Expected Cost	$ 3		$ 3

Restructuring and Other Costs_4

Restructuring and Other Costs - Schedule of Acquisition, Divestiture and Integration Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]
Acquisition costs			$ 27	$ 7.6
Divestiture costs			0.2	0.2
Integration costs			12	14.6
Other total	$ 10.5	$ 10.5	39.2	22.4
Other Segments [Member]
Restructuring Cost And Reserve [Line Items]
Acquisition costs	3	5.7	27	7.6
Divestiture costs	0.1	(0.1)	0.2	0.2
Integration costs	7.4	4.9	12	14.6
Other total	$ 10.5	$ 10.5	$ 39.2	$ 22.4

Restructuring and Other Costs_5

Restructuring and Other Costs - Schedule of Changes in Restructuring Accrual Charges (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring And Other Costs [Abstract]
Accrual at beginning of fiscal year	$ 31.6	$ 47.4
Additional accruals	32.3	8
Payments	(24.2)	(17.7)
Adjustment to accruals	(2.7)	1.4
Foreign currency rate changes	(0.1)	(0.3)
Accrual at March 31	$ 36.9	$ 38.8

Restructuring and Other Costs_6

Restructuring and Other Costs - Schedule of Reconciliation of Accruals and Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring And Other Costs [Abstract]
Additional accruals and adjustments to accruals (see table above)			$ 29.6	$ 9.4
Acquisition costs			27	7.6
Integration costs			12	14.6
Divestiture costs			0.2	0.2
Net property, plant and equipment			6.9	5.3
Severance and other employee costs			6.3	0.4
Equipment and inventory relocation costs			2.1	4.6
Facility carrying costs			2	2.4
Other costs			3.1	3.5
Restructuring and other costs	$ 34.8	$ 31.7	$ 89.2	$ 48

Retirement Plans - Additional I

Retirement Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Withdrawal Obligation	$ 240.8			$ 240.8		$ 247.8
Periods of Payments Used to Calculate Withdrawal Liability in Connection with PIUMPF Withdrawal			20 years
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions by employer to pension and supplemental retirement plans	5.5	$ 12.2		9.5	$ 20.7
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions by employer to pension and supplemental retirement plans	$ 1.7	$ 2		$ 4.4	$ 4.8
Pace Industry Union Management Pension Fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Withdrawal Obligation			$ 180
Central States, Southeast and Southwest Areas Pension Fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Withdrawal Obligation							$ 4.2

Retirement Plans - Summary of C

Retirement Plans - Summary of Components of Net Pension (Income) Cost and Summary of Components of Postretirement Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension withdrawals				$ 180
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11.4	$ 12.5	$ 22.3	24.1
Interest cost	58.7	51.3	115.2	102.2
Expected return on plan assets	(85.9)	(82.5)	(168.8)	(164.6)
Amortization of net actuarial loss (gain)	5.4	4.6	12.4	9.2
Amortization of prior service cost (credit)	1.3	1.1	2.6	2.2
Curtailment loss	0.9		0.9
Company defined benefit plan income	(8.2)	(13)	(15.4)	(26.9)
Multiemployer pension withdrawals				180
Multiemployer and other plans	0.1	0.3	0.3	1.1
Net pension (income) cost	(8.1)	(12.7)	(15.1)	154.2
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3	0.4	0.6	0.8
Interest cost	2	2	3.9	4
Amortization of net actuarial loss (gain)	(0.4)	(0.1)	(0.8)	(0.1)
Amortization of prior service cost (credit)	(0.7)	(1)	(1.4)	(2.1)
Net pension (income) cost	$ 1.2	$ 1.3	$ 2.3	$ 2.6

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rates	22.60%		7.70%	26.70%	(347.30%)
Tax cuts and jobs act, accounting complete		true
Income tax expense from revaluation of deferred tax assets and liabilities		$ 0.4
Additional income tax expense from transition tax provisional liability		$ 3.7

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes in Reserve for Uncertain Tax Position (Details) $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of fiscal year	$ 127.1
Additions related to purchase accounting	1	[1]
Additions for tax positions taken in current year	102.8	[2]
Additions for tax positions taken in prior fiscal years	1
Additions for currency translation adjustments	0.6
Reductions as a result of a lapse of the applicable statute of limitations	(0.7)
Balance at end of period	$ 231.8
[1]	Adjustment in fiscal 2019 relates to the KapStone Acquisition.
[2]	Additions for tax positions taken in current fiscal year includes primarily positions taken related to foreign subsidiaries

Segment Information - Additiona

Segment Information - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2019USD ($)segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment		3
Corrugated Packaging [Member] | Hurricane Michael [Member] | Cost of Goods Sold [Member]
Segment Reporting Information [Line Items]
Insurance proceeds recieved | $	$ 60	$ 80

Segment Information - Certain O

Segment Information - Certain Operating Data for Segments (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 4,620	$ 4,017		$ 8,947.4	$ 7,911
Multiemployer pension withdrawals					(180)
Land and Development impairments	(13)		$ (27.6)	(13)	(27.6)
Restructuring and other costs	(34.8)	(31.7)		(89.2)	(48)
Interest expense, net	(111.8)	(78.3)		(206.2)	(143.1)
Gain (loss) on extinguishment of debt	0.4	0.1		(1.5)	(0.9)
Other (expense) income, net	(3.3)	1.1		(6)	3.6
Income before income taxes	209.1	243.3		411.6	303.6
Identifiable assets	30,693			30,693		$ 25,360.5
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	4,659.8	4,055.3		9,026.3	7,987.7
Segment income	396	373.5		720.4	736.9
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(39.8)	(38.3)		(78.9)	(76.7)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Gain on sale of certain closed facilities				50.5
Multiemployer pension withdrawals					(180)
Land and Development impairments	(13)			(13)	(27.6)
Non-allocated expenses	(24.4)	(21.4)		(43.4)	(37.3)
Interest expense, net	(111.8)	(78.3)		(206.2)	(143.1)
Gain (loss) on extinguishment of debt	0.4	0.1		(1.5)	(0.9)
Other (expense) income, net	(3.3)	1.1		(6)	3.6
Corrugated Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	2,990.7			5,724.5
Identifiable assets	16,775.2			16,775.2		11,069.6
Corrugated Packaging [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	2,990.7	2,391.3		5,724.5	4,711
Segment income	310.3	262.8		557.1	532.7
Corrugated Packaging [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(19.4)	(22)		(37.4)	(41.4)
Corrugated Packaging [Member] | Unaffiliated Customers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	2,971.3	2,369.3		5,687.1	4,669.6
Consumer Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	1,668.3			3,287.1
Identifiable assets	11,220.3			11,220.3		11,511.1
Consumer Packaging [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	1,668.3	1,637.3		3,287.1	3,238.6
Segment income	85.2	94.6		162.1	188.8
Consumer Packaging [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(20.4)	(16.3)		(41.5)	(35.3)
Consumer Packaging [Member] | Unaffiliated Customers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	1,647.9	1,621		3,245.6	3,203.3
Land and Development [Member]
Segment Reporting Information [Line Items]
Net sales	0.8			14.7
Identifiable assets	34.4			34.4		49.1
Land and Development [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	0.8	26.7		14.7	38.1
Segment income	0.5	16.1		1.2	15.4
Land and Development [Member] | Unaffiliated Customers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	0.8	$ 26.7		14.7	$ 38.1
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Identifiable assets	33.5			33.5		59.5
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 2,629.6			$ 2,629.6		$ 2,671.2

Segment Information - Changes i

Segment Information - Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Roll Forward]
Goodwill, Gross beginning of period	$ 5,620.4
Accumulated impairment losses, beginning of period	(42.8)
Goodwill, beginning of period	5,577.6
Goodwill acquired	1,735
Purchase price allocation adjustments	0.3
Translation adjustments	(12)
Goodwill, Gross end of period	7,343.7
Accumulated impairment losses, end of period	(42.8)
Goodwill, end of period	7,300.9
Corrugated Packaging [Member]
Goodwill [Roll Forward]
Goodwill, Gross beginning of period	1,966.8
Accumulated impairment losses, beginning of period	(0.1)
Goodwill, beginning of period	1,966.7
Goodwill acquired	1,735
Purchase price allocation adjustments	0.9
Translation adjustments	2.8
Goodwill, Gross end of period	3,705.5
Accumulated impairment losses, end of period	(0.1)
Goodwill, end of period	3,705.4
Consumer Packaging [Member]
Goodwill [Roll Forward]
Goodwill, Gross beginning of period	3,653.6
Accumulated impairment losses, beginning of period	(42.7)
Goodwill, beginning of period	3,610.9
Purchase price allocation adjustments	(0.6)
Translation adjustments	(14.8)
Goodwill, Gross end of period	3,638.2
Accumulated impairment losses, end of period	(42.7)
Goodwill, end of period	$ 3,595.5

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Inventories [Abstract]
Finished goods and work in process	$ 956.5	$ 867
Raw materials	844	730
Spare parts and supplies	460.8	368.2
Inventories at FIFO cost	2,261.3	1,965.2
LIFO reserve	(164.4)	(135.6)
Net inventories	$ 2,096.9	$ 1,829.6

Assets Held For Sale - Addition

Assets Held For Sale - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale	$ 33.5	$ 59.5
Land and Development Portfolio Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale	$ 22.1	$ 33.5

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Property, plant and equipment at cost:
Property, plant and equipment, at cost	$ 16,848.1	$ 14,419.9
Less: accumulated depreciation, depletion and amortization	(5,818.7)	(5,337.4)
Property, plant and equipment, net	11,029.4	9,082.5
Land and Buildings [Member]
Property, plant and equipment at cost:
Property, plant and equipment, at cost	2,360.9	2,078.9
Machinery and Equipment [Member]
Property, plant and equipment at cost:
Property, plant and equipment, at cost	14,206.1	12,064
Forestlands and Mineral Rights [Member]
Property, plant and equipment at cost:
Property, plant and equipment, at cost	149.9	158
Transportation Equipment [Member]
Property, plant and equipment at cost:
Property, plant and equipment, at cost	31	30.1
Leasehold Improvements [Member]
Property, plant and equipment at cost:
Property, plant and equipment, at cost	$ 100.2	$ 88.9

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Sep. 25, 2018	Sep. 29, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Land and Development impairments	$ 13	$ 27.6	$ 13	$ 27.6
Maximum eligible receivables that may be sold					$ 550	$ 490
Estimated loss on sale of accounts receivable by quarter			$ 4
ASU 2016-15 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Decrease in cash provided by operating activities				253.1
Increase in cash provided by investing activities				$ 253.1
Real Estate [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of intangible assets, finite-lived		4
Mineral Rights [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of intangible assets, finite-lived		$ 23.6

Fair Value - Summary of Activit

Fair Value - Summary of Activity Under A/R Sales Agreement (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Receivable from financial institution at beginning of fiscal year		$ 24.9
Receivables sold to the financial institution and derecognized	$ 943	790.2
Receivables collected by financial institution	(956.4)	(783.3)
Cash paid to (proceeds from) financial institution	$ 13.4	(10)
Receivable from financial institution at March 31		$ 21.8

Debt - Schedule of Carrying Val

Debt - Schedule of Carrying Value of Individual Components of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Total debt	$ 10,795.5	$ 6,415.2
Less: current portion of debt	1,422.4	740.7
Long-term debt due after one year	9,373.1	5,674.5
Notes Due Fiscal 2019 to 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	1,114.1	1,470.9
Notes Due Fiscal 2023 to 2028 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	3,271.3	2,534.4
Notes Due Fiscal 2029 to 2033 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	1,707.8	964.1
Notes Due Fiscal 2037 to 2047 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	179.1	178.5
Term Loan Facilities [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	2,905.8	599.4
Revolving Credit and Swing Facilities [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	527.2	355
Receivables Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	150
Commercial Paper [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	588.3
Capital Lease Obligations [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	189	171
Supplier Financing and Commercial Card Programs [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	130.1	105.1
International and Other Debt [Member]
Debt Instrument [Line Items]
Total debt	$ 32.8	$ 36.8

Debt - Additional Information (

Debt - Additional Information (Details)

Apr. 10, 2019BRL (R$)Drawdown

Feb. 26, 2019

Dec. 07, 2018USD ($)

Dec. 03, 2018USD ($)

Apr. 27, 2018EUR (€)

Mar. 07, 2018USD ($)

Mar. 06, 2018USD ($)

Aug. 24, 2017USD ($)

Jul. 22, 2016USD ($)

Oct. 31, 2017USD ($)

Mar. 31, 2019USD ($)

Mar. 31, 2018USD ($)

Apr. 15, 2019BRL (R$)

Sep. 30, 2018USD ($)

Debt Instrument [Line Items]

Fair value of debt

$ 11,000,000,000

$ 6,400,000,000

Repayment of debt

$ 3,209,600,000

$ 2,010,400,000

DDTL Credit Agreement [Member]

Debt Instrument [Line Items]

Credit Facility, maximum borrowing capacity

$ 3,800,000,000

Debt instrument, interest rate description

The applicable interest rate margin was initially 1.125% to 2.000% per annum for LIBOR rate loans and 0.125% to 1.000% per annum for alternate base rate loans, in each case depending on the Leverage Ratio (as defined in the credit agreement) or our corporate credit ratings, whichever yields a lower applicable interest rate margin, at such time. On February 26, 2019, we amended the Delayed Draw Credit Facilities agreement. The applicable interest rate margin for the 3-year term loan is now 1.000% to 1.875% for LIBOR rate loans and 0.000% to 0.875% for alternate base rate loans. The applicable interest rate margin for the 5-year term loan is now 1.000% to 1.950% for LIBOR rate loans and 0.000% to 0.950% for alternate base rate loans.

Debt issuance costs

$ 7,500,000

DDTL Credit Agreement [Member] | Minimum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

1.125%

DDTL Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

0.125%

DDTL Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

2.00%

DDTL Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

1.00%

Senior Notes due 2026 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 750,000,000

Debt instrument, interest rate

4.65%

Debt instrument, maturity year

2026

Debt instrument, discount

$ 1,100,000

Debt instrument, issuance costs

6,000,000

Debt instrument, effective interest rate

4.80%

Senior Notes due 2026 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 749,300,000

Senior Notes due 2029 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 750,000,000

Debt instrument, interest rate

4.90%

Debt instrument, maturity year

2029

Debt instrument, discount

$ 400,000

Debt instrument, issuance costs

$ 6,200,000

Debt instrument, effective interest rate

5.01%

Senior Notes due 2029 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 750,000,000

Senior Notes due 2024 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 500,000,000

Debt instrument, interest rate

3.00%

Debt instrument, maturity year

2024

Senior Notes due 2024 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

490,000,000

Senior Notes due 2025 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 600,000,000

Debt instrument, interest rate

3.75%

Debt instrument, maturity year

2025

Senior Notes due 2025 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

600,000,000

Senior Notes due 2027 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 500,000,000

Debt instrument, interest rate

3.375%

Debt instrument, maturity year

2027

Senior Notes due 2027 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

491,000,000

Senior Notes due 2028 [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

$ 600,000,000

Debt instrument, interest rate

4.00%

Debt instrument, maturity year

2028

Senior Notes due 2028 [Member] | Tendered and Exchanged Notes [Member]

Debt Instrument [Line Items]

Debt instrument, aggregate principal amount

590,000,000

364-Day Term Loan [Member] | DDTL Credit Agreement [Member]

Debt Instrument [Line Items]

Debt instrument, maturity period

364 days

364 days

Credit Facility, maximum borrowing capacity

$ 300,000,000

Repayment of debt

$ 300,000,000

Three Year Term Loan [Member] | DDTL Credit Agreement [Member]

Debt Instrument [Line Items]

Debt instrument, maturity period

3 years

3 years

3 years

Credit Facility, maximum borrowing capacity

$ 1,750,000,000

Prepayment of outstanding principle amount

$ 926,500,000

Long-term debt

822,500,000

Three Year Term Loan [Member] | DDTL Credit Agreement [Member] | Minimum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

1.00%

Three Year Term Loan [Member] | DDTL Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

0.00%

Three Year Term Loan [Member] | DDTL Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

1.875%

Three Year Term Loan [Member] | DDTL Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

0.875%

Five Year Term Loan | DDTL Credit Agreement [Member]

Debt Instrument [Line Items]

Debt instrument, maturity period

5 years

5 years

5 years

Credit Facility, maximum borrowing capacity

$ 1,750,000,000

Prepayment of outstanding principle amount

$ 262,500,000

Long-term debt

1,483,900,000

Five Year Term Loan | DDTL Credit Agreement [Member] | Minimum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

1.00%

Five Year Term Loan | DDTL Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

0.00%

Five Year Term Loan | DDTL Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Applicable margin

1.95%

Five Year Term Loan | DDTL Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Applicable margin

0.95%

Receivables Facility [Member] | Secured Debt [Member]

Debt Instrument [Line Items]

Receivables backed financing, maximum borrowing amount

$ 700,000,000

Debt instrument, maturity date

Jul. 22, 2019

Debt instrument, maximum borrowing capacity, amount

526,400,000

571,000,000

Loans and Leases Receivable, Collateral for Secured Borrowings

795,800,000

$ 887,000,000

Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] | Unsecured Debt [Member]

Debt Instrument [Line Items]

Debt instrument, maturity period

3 years

Incremental line of credit | €

€ 100,000,000

Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] | Unsecured Debt [Member] | Foreign Exchange Contracts [Member]

Debt Instrument [Line Items]

Amount of foreign exchange contracts

461,400,000

Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] | Unsecured Debt [Member]

Debt Instrument [Line Items]

Credit Facility, maximum borrowing capacity | €

500,000,000

Long-term debt

460,000,000

Line of credit facility, maximum Euro denominated borrowing capacity | €

€ 500,000,000

Credit facility, maturity date

Apr. 27, 2021

Commercial Paper [Member] | Unsecured Debt [Member]

Debt Instrument [Line Items]

Long-term debt

250,000,000

Aggregate Principal Amount of Short-term Unsecured Commercial Paper Program, Maximum

$ 1,000,000,000

$ 1,000,000,000

Debt Instrument, notice period for termination

30 days

Borrowings outstanding

$ 588,300,000

Average borrowing rate

2.77%

Commercial Paper [Member] | Unsecured Debt [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt instrument, maturity period

397 days

397 days

Revolving Credit Facility [Member] | Unsecured Debt [Member]

Debt Instrument [Line Items]

Credit Facility, maximum borrowing capacity

$ 2,000,000,000

Brazil Delayed Draw Credit Facilities [Member] | Unsecured Debt [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Credit Facility, maximum borrowing capacity | R$

R$ 750000000

Long-term debt | R$

R$ 125000000

Incremental line of credit | R$

R$ 250000000

Credit facility, maturity date

Apr. 10, 2024

Credit facility initial drowdowns period

18 months

Number of drawdowns under credit facility | Drawdown

10

Minimum amount drawdown under credit facility | R$

R$ 50000000

Credit facility semiannual installments repayment beginning date

Apr. 10, 2021

Credit facility basis spread on floating rate

1.50%

Percentage of fee paid on unused credit facility

0.45%

Debt - Schedule of Aggregate Ma

Debt - Schedule of Aggregate Maturities of Debt (Details) $ in Millions	Mar. 31, 2019USD ($)
Long-term Debt, Excluding Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Remaining fiscal 2019	$ 1,056.6
Fiscal 2020	468.2
Fiscal 2021	352.7
Fiscal 2022	2,251.8
Fiscal 2023	527.7
Thereafter	5,766.6
Fair value of debt step-up, deferred financing costs and unamortized bond discounts	182.9
Total	10,606.5
Capital Lease Obligations [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Remaining fiscal 2019	3.5
Fiscal 2020	6.1
Fiscal 2021	4.3
Fiscal 2022	3.5
Fiscal 2023	1.9
Thereafter	151.8
Fair value of debt step-up, deferred financing costs and unamortized bond discounts	17.9
Total	$ 189

Selected Condensed Consolidat_3

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements Captions [Line Items]
Net sales	$ 4,620	$ 4,017		$ 8,947.4	$ 7,911
Cost of goods sold	3,720.4	3,227.6		7,266	6,348.1
Selling, general and administrative, excluding intangible amortization	444.1	395.8		845	776.6
Selling, general and administrative intangible amortization	102.4	75.2		195.3	147.7
Loss (gain) on disposal of assets		2.8		(43.8)	3.9
Multiemployer pension withdrawals					180
Land and Development impairments	13		$ 27.6	13	27.6
Restructuring and other costs	34.8	31.7		89.2	48
Operating profit (loss)	305.3	283.9		582.7	379.1
Interest expense, net	(111.8)	(78.3)		(206.2)	(143.1)
Gain (loss) on extinguishment of debt	0.4	0.1		(1.5)	(0.9)
Pension and other postretirement non- service (expense) income	18.7	24.6		36	49.2
Other (expense) income, net	(3.3)	1.1		(6)	3.6
Equity in income of unconsolidated entities	(0.2)	11.9		6.6	15.7
Income before income taxes	209.1	243.3		411.6	303.6
Income tax benefit (expense)	(47.2)	(18.8)		(109.9)	1,054.4
Consolidated net income	161.9	224.5		301.7	1,358
Less: Net (income) loss attributable to noncontrolling interests	(1.5)	(1.3)		(2.2)	0.3
Net income attributable to common stockholders	160.4	223.2		299.5	1,358.3
Comprehensive income (loss) attributable to common stockholders	189.7	279.1		269.3	1,373.9
Parent [Member]
Condensed Income Statements Captions [Line Items]
Interest expense, net		(0.1)			(0.1)
Equity in income of consolidated entities	160.4			299.5
Income before income taxes	160.4	(0.1)		299.5	(0.1)
Consolidated net income	160.4	(0.1)		299.5	(0.1)
Net income attributable to common stockholders	160.4	(0.1)		299.5	(0.1)
Comprehensive income (loss) attributable to common stockholders	189.7	(0.1)		269.3	(0.1)
Issuer [Member]
Condensed Income Statements Captions [Line Items]
Selling, general and administrative, excluding intangible amortization	0.3	0.4		0.4	0.4
Multiemployer pension withdrawals					6.5
Restructuring and other costs	3.9	2.5		3.9	3.3
Operating profit (loss)	(4.2)	(2.9)		(4.3)	(10.2)
Interest expense, net	(65)	(28.6)		(112)	(43.9)
Intercompany interest income (expense), net	0.5	6.2		3.5	11.8
Gain (loss) on extinguishment of debt		(0.7)		(1.8)	(1.6)
Other (expense) income, net	(3.4)	0.6		(4)	1
Equity in income of consolidated entities	196.9	242.4		396.7	1,394.4
Income before income taxes	124.8	217		278.1	1,351.5
Income tax benefit (expense)	14.1	6.3		29	6.9
Consolidated net income	138.9	223.3		307.1	1,358.4
Net income attributable to common stockholders	138.9	223.3		307.1	1,358.4
Comprehensive income (loss) attributable to common stockholders	168.3	279.2		277.1	1,374
Guarantor Subsidiaries [Member]
Condensed Income Statements Captions [Line Items]
Net sales	639.2	633.7		1,263	1,243.8
Cost of goods sold	526.8	512.1		1,027.7	959.6
Selling, general and administrative, excluding intangible amortization	14.2	24.9		27.3	49.3
Selling, general and administrative intangible amortization	26.3	26.1		52.3	52.1
Loss (gain) on disposal of assets		0.1			0.1
Multiemployer pension withdrawals					12.5
Restructuring and other costs		4.2		0.1	5.3
Operating profit (loss)	71.9	66.3		155.6	164.9
Interest expense, net	(42)	(43.5)		(91.9)	(87.7)
Intercompany interest income (expense), net	(27.5)	(16.5)		(54.6)	(32.3)
Gain (loss) on extinguishment of debt	0.4	0.9		0.4	0.9
Pension and other postretirement non- service (expense) income	(1.7)	(0.2)		(3.4)	(0.3)
Other (expense) income, net	(1)	2.6		(0.4)	4.3
Equity in income of unconsolidated entities					2.5
Equity in income of consolidated entities	168.8	129.5		417.3	1,023.1
Income before income taxes	168.9	139.1		423	1,075.4
Income tax benefit (expense)	0.6	(0.1)		(1.3)	124.4
Consolidated net income	169.5	139		421.7	1,199.8
Net income attributable to common stockholders	169.5	139		421.7	1,199.8
Comprehensive income (loss) attributable to common stockholders	201.6	213.9		394.5	1,229.5
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements Captions [Line Items]
Net sales	4,638.1	4,034.3		8,971.9	7,958
Cost of goods sold	3,850.9	3,366.5		7,525.8	6,679.3
Selling, general and administrative, excluding intangible amortization	429.6	370.5		817.3	726.9
Selling, general and administrative intangible amortization	76.1	49.1		143	95.6
Loss (gain) on disposal of assets		2.7		(43.8)	3.8
Multiemployer pension withdrawals					161
Land and Development impairments	13			13	27.6
Restructuring and other costs	30.9	25		85.2	39.4
Operating profit (loss)	237.6	220.5		431.4	224.4
Interest expense, net	(4.8)	(6.1)		(2.3)	(11.4)
Intercompany interest income (expense), net	27	10.3		51.1	20.5
Gain (loss) on extinguishment of debt		(0.1)		(0.1)	(0.2)
Pension and other postretirement non- service (expense) income	20.4	24.8		39.4	49.5
Other (expense) income, net	1.1	(2.1)		(1.6)	(1.7)
Equity in income of unconsolidated entities	(0.2)	11.9		6.6	13.2
Income before income taxes	281.1	259.2		524.5	294.3
Income tax benefit (expense)	(61.9)	(25)		(137.6)	923.1
Consolidated net income	219.2	234.2		386.9	1,217.4
Less: Net (income) loss attributable to noncontrolling interests	(1.5)	(1.3)		(2.2)	0.3
Net income attributable to common stockholders	217.7	232.9		384.7	1,217.7
Comprehensive income (loss) attributable to common stockholders	247	288.8		354.7	1,233.6
Eliminations [Member]
Condensed Income Statements Captions [Line Items]
Net sales	(657.3)	(651)		(1,287.5)	(1,290.8)
Cost of goods sold	(657.3)	(651)		(1,287.5)	(1,290.8)
Equity in income of consolidated entities	(526.1)	(371.9)		(1,113.5)	(2,417.5)
Income before income taxes	(526.1)	(371.9)		(1,113.5)	(2,417.5)
Consolidated net income	(526.1)	(371.9)		(1,113.5)	(2,417.5)
Net income attributable to common stockholders	(526.1)	(371.9)		(1,113.5)	(2,417.5)
Comprehensive income (loss) attributable to common stockholders	$ (616.9)	$ (502.7)		$ (1,026.3)	$ (2,463.1)

Selected Condensed Consolidat_4

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018
Current Assets:
Cash and cash equivalents	$ 154.2	$ 636.8
Accounts receivable	2,367	2,010.7
Inventories	2,096.9	1,829.6
Other current assets	562.4	248.5
Assets held for sale	33.5	59.5
Total current assets	5,214	4,785.1
Property, plant and equipment, net	11,029.4	9,082.5
Goodwill	7,300.9	5,577.6
Intangibles, net	4,277.9	3,122
Restricted assets held by special purpose entities	1,277.7	1,281
Prepaid pension asset	447.7	420
Other assets	1,145.4	1,092.3
Total Assets	30,693	25,360.5
Current liabilities:
Current portion of debt	1,422.4	740.7
Accounts payable	1,702	1,716.8
Accrued compensation and benefits	380.6	399.3
Other current liabilities	541.6	476.5
Total current liabilities	4,046.6	3,333.3
Long-term debt due after one year	9,373.1	5,674.5
Pension liabilities, net of current portion	251	261.3
Postretirement benefit liabilities, net of current portion	141.5	134.8
Non-recourse liabilities held by special purpose entities	1,149.5	1,153.7
Deferred income taxes	2,955.2	2,321.5
Other long-term liabilities	1,119.3	994.8
Redeemable noncontrolling interests	3.2	4.2
Total stockholders’ equity	11,640.8	11,469.4	$ 11,547.9
Noncontrolling interests	12.8	13
Total equity	11,653.6	11,482.4	$ 11,582.2
Total Liabilities and Equity	30,693	25,360.5
Parent [Member]
Current Assets:
Other current assets	0.5
Total current assets	0.5
Investments in consolidated subsidiaries	11,797.4
Other assets		3.4
Total Assets	11,797.9	3.4
Current liabilities:
Accrued compensation and benefits	0.1
Intercompany payables	157	13
Total current liabilities	157.1	13
Total stockholders’ equity	11,640.8	(9.6)
Total equity	11,640.8	(9.6)
Total Liabilities and Equity	11,797.9	3.4
Issuer [Member]
Current Assets:
Cash and cash equivalents		0.2
Accounts receivable		0.1
Other current assets	0.7	0.4
Intercompany receivables	154	27.7
Total current assets	154.7	28.4
Intercompany notes receivable	155	884.2
Investments in consolidated subsidiaries	18,075.3	13,260.3
Other assets	14.2	12.4
Total Assets	18,399.2	14,185.3
Current liabilities:
Current portion of debt	405.6
Accounts payable	1.1	0.8
Accrued compensation and benefits		0.2
Other current liabilities	7.3	3.2
Intercompany payables	504.5	506.6
Total current liabilities	918.5	510.8
Long-term debt due after one year	6,223.9	2,179.4
Other long-term liabilities	14.6	16.1
Total stockholders’ equity	11,242.2	11,479
Total equity	11,242.2	11,479
Total Liabilities and Equity	18,399.2	14,185.3
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	19.6	490.8
Accounts receivable	182.8	196.5
Inventories	254.8	233.4
Other current assets	8.2	17.2
Intercompany receivables	23	269.8
Total current assets	488.4	1,207.7
Property, plant and equipment, net	22.2	21.3
Goodwill	1,151.3	1,151.3
Intangibles, net	1,537.1	1,589.4
Intercompany notes receivable	31.9	33.1
Investments in consolidated subsidiaries	19,938.9	15,066.3
Other assets	181.4	172.8
Total Assets	23,351.2	19,241.9
Current liabilities:
Current portion of debt	603.8	609.5
Accounts payable	34.7	40.3
Accrued compensation and benefits	10.2	10.7
Other current liabilities	99.1	77.7
Intercompany payables	0.8	570.4
Total current liabilities	748.6	1,308.6
Long-term debt due after one year	2,101.7	2,460.1
Intercompany notes payable	2,941.1	2,865.4
Pension liabilities, net of current portion	135.4	135.9
Postretirement benefit liabilities, net of current portion	28	28.1
Deferred income taxes	267.3	291
Other long-term liabilities	135.7	106.2
Total stockholders’ equity	16,993.4	12,046.6
Total equity	16,993.4	12,046.6
Total Liabilities and Equity	23,351.2	19,241.9
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	134.6	145.8
Accounts receivable	2,217.5	1,840.2
Inventories	1,842.1	1,596.2
Other current assets	553	230.9
Intercompany receivables	485.6	792.8
Assets held for sale	33.5	59.5
Total current assets	5,266.3	4,665.4
Property, plant and equipment, net	11,007.2	9,061.2
Goodwill	6,149.6	4,426.3
Intangibles, net	2,740.8	1,532.6
Restricted assets held by special purpose entities	1,277.7	1,281
Prepaid pension asset	447.7	420
Intercompany notes receivable	2,941.1	2,865.4
Other assets	959.4	910.8
Total Assets	30,789.8	25,162.7
Current liabilities:
Current portion of debt	413	131.2
Accounts payable	1,699.5	1,701.8
Accrued compensation and benefits	370.3	388.4
Other current liabilities	435.2	395.6
Intercompany payables	0.3	0.3
Total current liabilities	2,918.3	2,617.3
Long-term debt due after one year	1,047.5	1,035
Intercompany notes payable	186.9	917.3
Pension liabilities, net of current portion	115.6	125.4
Postretirement benefit liabilities, net of current portion	113.5	106.7
Non-recourse liabilities held by special purpose entities	1,149.5	1,153.7
Deferred income taxes	2,697.5	2,037.6
Other long-term liabilities	969	872.5
Redeemable noncontrolling interests	3.2	4.2
Total stockholders’ equity	21,576	16,280
Noncontrolling interests	12.8	13
Total equity	21,588.8	16,293
Total Liabilities and Equity	30,789.8	25,162.7
Eliminations [Member]
Current Assets:
Accounts receivable	(33.3)	(26.1)
Intercompany receivables	(662.6)	(1,090.3)
Total current assets	(695.9)	(1,116.4)
Intercompany notes receivable	(3,128)	(3,782.7)
Investments in consolidated subsidiaries	(49,811.6)	(28,326.6)
Other assets	(9.6)	(7.1)
Total Assets	(53,645.1)	(33,232.8)
Current liabilities:
Accounts payable	(33.3)	(26.1)
Intercompany payables	(662.6)	(1,090.3)
Total current liabilities	(695.9)	(1,116.4)
Intercompany notes payable	(3,128)	(3,782.7)
Deferred income taxes	(9.6)	(7.1)
Total stockholders’ equity	(49,811.6)	(28,326.6)
Total equity	(49,811.6)	(28,326.6)
Total Liabilities and Equity	$ (53,645.1)	$ (33,232.8)

Selected Condensed Consolidat_5

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net cash provided by (used for) operating activities	$ 665	$ 473.7
Investing activities:
Capital expenditures	(625.4)	(426.7)
Cash paid related to business combinations, net of cash acquired	(3,349.3)	(185.2)
Cash receipts on sold trade receivables		253.1
Investment in unconsolidated entities	(0.2)	(111)
Proceeds from sale of property, plant and equipment	105.3	15.7
Proceeds from property, plant and equipment insurance settlement	8.8	4.8
Other	10.2	8.2
Net cash used for investing activities	(3,850.6)	(441.1)
Financing activities:
Proceeds from issuance of notes	1,498.5	1,197.3
(Repayments) additions to revolving credit facilities	172	94.3
Additions to debt	3,957.9	853.2
Repayments of debt	(3,209.6)	(2,010.4)
Changes in commercial paper, net	588.3	63.3
Other financing additions (repayments), net	16.6	(24.5)
Issuances of common stock, net of related minimum tax withholdings	3.2	17.4
Purchases of common stock	(88.6)
Cash dividends paid to stockholders	(233.7)	(219.4)
Cash distributions paid to noncontrolling interests	(2.8)	(8.6)
Other	3	(24.9)
Net cash provided by (used for) financing activities	2,704.8	(62.3)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1.8)	(1.9)
Decrease in cash, cash equivalents and restricted cash	(482.6)	(31.6)
Cash, cash equivalents and restricted cash at beginning of period	636.8	304
Cash, cash equivalents and restricted cash at end of period	154.2	272.4
Parent [Member]
Operating activities:
Net cash provided by (used for) operating activities	319.1	4
Investing activities:
Intercompany capital investment	(563)
Net cash used for investing activities	(563)
Financing activities:
Issuances of common stock, net of related minimum tax withholdings	3.2
Purchases of common stock	(88.6)
Cash dividends paid to stockholders	(233.7)
Intercompany capital receipt	563
Other		(4)
Net cash provided by (used for) financing activities	243.9	(4)
Issuer [Member]
Operating activities:
Net cash provided by (used for) operating activities	(93.4)	(488.3)
Investing activities:
Intercompany notes proceeds	9.2
Intercompany capital investment	(563)	(755.3)
Intercompany return of capital		1,356.3
Net cash used for investing activities	(553.8)	601
Financing activities:
Proceeds from issuance of notes	1,498.5	1,197.3
(Repayments) additions to revolving credit facilities	67.5	(59.8)
Additions to debt	3,801.9	2.7
Repayments of debt	(1,489.7)	(1,025.2)
Changes in commercial paper, net	588.3	63.3
Issuances of common stock, net of related minimum tax withholdings		17.4
Cash dividends paid to stockholders		(219.4)
Intercompany notes payments	(3,800)	(69)
Other	(19.5)	(20)
Net cash provided by (used for) financing activities	647	(112.7)
Decrease in cash, cash equivalents and restricted cash	(0.2)
Cash, cash equivalents and restricted cash at beginning of period	0.2
Cash, cash equivalents and restricted cash at end of period	0
Guarantor Subsidiaries [Member]
Operating activities:
Net cash provided by (used for) operating activities	(196.9)	(268.8)
Investing activities:
Capital expenditures	(2.4)	(0.4)
Intercompany notes issued		(1.4)
Intercompany notes proceeds	1.3	3.2
Intercompany capital investment		(300.8)
Intercompany return of capital		821
Other	8.6	6.6
Net cash used for investing activities	7.5	528.2
Financing activities:
Repayments of debt	(357.5)	(14.8)
Other financing additions (repayments), net		(5.9)
Intercompany notes borrowing	75.7	375.9
Intercompany notes payments		(14)
Intercompany capital receipt		736.9
Intercompany capital distribution		(1,356.3)
Net cash provided by (used for) financing activities	(281.8)	(278.2)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(0.1)
Decrease in cash, cash equivalents and restricted cash	(471.2)	(18.9)
Cash, cash equivalents and restricted cash at beginning of period	490.8	43.3
Cash, cash equivalents and restricted cash at end of period	19.6	24.4
Non-Guarantor Subsidiaries [Member]
Operating activities:
Net cash provided by (used for) operating activities	1,208.6	1,541
Investing activities:
Capital expenditures	(623)	(426.3)
Cash paid related to business combinations, net of cash acquired	(3,349.3)	(185.2)
Cash receipts on sold trade receivables		253.1
Investment in unconsolidated entities	(0.2)	(111)
Proceeds from sale of property, plant and equipment	105.3	15.7
Proceeds from property, plant and equipment insurance settlement	8.8	4.8
Intercompany notes issued	(75.7)	(375.9)
Intercompany notes proceeds	3,800	83
Other	1.6	1.6
Net cash used for investing activities	(132.5)	(740.2)
Financing activities:
(Repayments) additions to revolving credit facilities	104.5	154.1
Additions to debt	156	850.5
Repayments of debt	(1,362.4)	(970.4)
Other financing additions (repayments), net	16.6	(18.6)
Cash distributions paid to noncontrolling interests	(2.8)	(8.6)
Intercompany notes borrowing		1.4
Intercompany notes payments	(10.5)	(3.2)
Intercompany capital receipt	563	319.2
Intercompany capital distribution		(821)
Intercompany dividends	(572.4)	(314.2)
Other	22.5	(0.9)
Net cash provided by (used for) financing activities	(1,085.5)	(811.7)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1.8)	(1.8)
Decrease in cash, cash equivalents and restricted cash	(11.2)	(12.7)
Cash, cash equivalents and restricted cash at beginning of period	145.8	260.7
Cash, cash equivalents and restricted cash at end of period	134.6	248
Eliminations [Member]
Operating activities:
Net cash provided by (used for) operating activities	(572.4)	(314.2)
Investing activities:
Intercompany notes issued	75.7	377.3
Intercompany notes proceeds	(3,810.5)	(86.2)
Intercompany capital investment	1,126	1,056.1
Intercompany return of capital		(2,177.3)
Net cash used for investing activities	(2,608.8)	(830.1)
Financing activities:
Intercompany notes borrowing	(75.7)	(377.3)
Intercompany notes payments	3,810.5	86.2
Intercompany capital receipt	(1,126)	(1,056.1)
Intercompany capital distribution		2,177.3
Intercompany dividends	572.4	314.2
Net cash provided by (used for) financing activities	$ 3,181.2	$ 1,144.3

Selected Condensed Consolidat_6

Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Noncash Investing and Financing Activities (Details) $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)
Parent [Member]
Operating activities:
Intercompany receivables	$ (140.9)
Investing activities:
Intercompany capital investment	(10,396.2)
Intercompany return of capital	563
Financing activities:
Intercompany capital distribution	(563)
Issuer [Member]
Investing activities:
Intercompany notes issued	(3,800)
Intercompany notes proceeds	4,519.8
Intercompany capital investment	(5,434.8)
Intercompany return of capital	1,478
Financing activities:
Intercompany notes borrowing	3,800
Intercompany capital receipt	10,396.2
Intercompany capital distribution	(563)
Guarantor Subsidiaries [Member]
Investing activities:
Intercompany notes issued	(4,519.8)
Intercompany notes proceeds	4,519.8
Intercompany capital investment	(5,983.6)
Intercompany return of capital	915
Financing activities:
Intercompany notes borrowing	457.5
Intercompany notes payments	(457.5)
Intercompany capital receipt	4,977.3
Intercompany capital distribution	(457.5)
Non-Guarantor Subsidiaries [Member]
Operating activities:
Intercompany payables	140.9
Investing activities:
Intercompany notes issued	(8,057.5)
Intercompany notes proceeds	4,257.5
Financing activities:
Intercompany notes borrowing	12,119.8
Intercompany notes payments	(12,839.6)
Intercompany capital receipt	6,441.1
Intercompany capital distribution	(1,372.5)
Eliminations [Member]
Operating activities:
Intercompany receivables	140.9
Intercompany payables	(140.9)
Investing activities:
Intercompany notes issued	16,377.3
Intercompany notes proceeds	(13,297.1)
Intercompany capital investment	21,814.6
Intercompany return of capital	(2,956)
Financing activities:
Intercompany notes borrowing	(16,377.3)
Intercompany notes payments	13,297.1
Intercompany capital receipt	(21,814.6)
Intercompany capital distribution	$ 2,956

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	Dec. 07, 2018USD ($)	Mar. 31, 2019USD ($)lawsuit
Commitments and Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		$ 10.8
Litigation cost reimbursement	$ 0.1
Number of Lawsuits the Company Has Been Named a Defendant in Asbestos-related Personal Injury Litigation | lawsuit		800
Guarantor Obligations, Estimated Exposure, Undiscounted		$ 50
Guarantor Obligations, Current Carrying Value		11.8
Other Long Term Liabilities [Member]
Commitments and Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		6.7
Other Current Liabilities [Member]
Commitments and Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		$ 4.1

Equity and Other Comprehensiv_3

Equity and Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Nov. 02, 2018	Sep. 30, 2018	Jul. 01, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Stock repurchase program, number of shares authorized to be repurchased					40,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Authorized share repurchase as a percentage of common stock outstanding					15.00%
Stock repurchase program, remaining number of shares authorized to be repurchased	19,100,000
Treasury stock, shares, acquired	2,100,000	0
Purchases of common stock	$ 88.6
Minimum [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Effective Tax Rate, Net of Tax Components of Other Comprehensive Income	25.00%	27.00%
Maximum [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Effective Tax Rate, Net of Tax Components of Other Comprehensive Income	26.00%	28.00%

Equity and Other Comprehensiv_4

Equity and Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	[1]	$ (695.3)	$ (457.3)
Other comprehensive (loss) income before reclassifications	[1]	(39)	10.1
Amounts reclassified from accumulated other comprehensive loss (income)	[1]	8.8	5.5
Net current period other comprehensive income (loss)	[1]	(30.2)	15.6
Balance at end of period	[1]	(725.5)	(441.7)
Accumulated Net Gain (Loss) from Designated or Quality Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		(0.2)	(0.7)
Amounts reclassified from accumulated other comprehensive loss (income)			0.5
Net current period other comprehensive income (loss)			0.5
Balance at end of period		(0.2)	(0.2)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		(465.9)	(462.5)
Other comprehensive (loss) income before reclassifications			(2.8)
Amounts reclassified from accumulated other comprehensive loss (income)		8.8	6.5
Net current period other comprehensive income (loss)		8.8	3.7
Balance at end of period		(457.1)	(458.8)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		(229.2)	5.2
Other comprehensive (loss) income before reclassifications		(39)	12.1
Net current period other comprehensive income (loss)		(39)	12.1
Balance at end of period		$ (268.2)	17.3
Accumulated Net Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period			0.7
Other comprehensive (loss) income before reclassifications			0.8
Amounts reclassified from accumulated other comprehensive loss (income)			(1.5)
Net current period other comprehensive income (loss)			$ (0.7)
[1]	All amounts are net of tax and noncontrolling interests.

Equity and Other Comprehensiv_5

Equity and Other Comprehensive Income (Loss) - Summary of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Mar. 31, 2019		Mar. 31, 2018		Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization and settlement recognition of net actuarial loss, included in pension cost		$ 3.2		$ 3.3		$ 8.1	$ 6.6
Amortization of prior service costs, Net of Tax		0.4				0.9
Available for sale security, net of tax				(1.5)			(1.5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax							0.5
Parent [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial loss, Pre-Tax Amount	[1],[2]	(4.1)		(4.5)		(10.7)	(8.9)
Amortization of net actuarial loss, Tax	[1],[2]	1.1		1.2		2.8	2.4
Amortization and settlement recognition of net actuarial loss, included in pension cost	[1],[2]	(3)		(3.3)		(7.9)	(6.5)
Amortization of prior service costs, Pre-Tax Amount	[1]	(0.6)	[2]			(1.2)
Amortization of prior service costs, Tax	[1]	0.2	[2]			0.3
Amortization of prior service costs, Net of Tax	[1]	(0.4)	[2]			(0.9)
Defined Benefit Plans, before Tax	[1]	(4.7)		(4.5)		(11.9)	(8.9)
Defined Benefit Plans, Tax	[1]	1.3		1.2		3.1	2.4
Defined Benefit Plans, Net of Tax	[1]	(3.4)		(3.3)		(8.8)	(6.5)
Available for sale security, before tax	[1]			1.5	[3]		1.5	[4]
Available for sale security, net of tax	[1]			1.5	[3]		1.5	[4]
Total Reclassifications From Other Comprehensive Income Before Tax	[1]	(4.7)		(3)		(11.9)	(8.1)
Total Reclassifications From Other Comprehensive Income Tax Portion	[1]	1.3		1.2		3.1	2.6
Total Reclassifications From Other Comprehensive Income Net Of Tax	[1]	$ (3.4)		$ (1.8)		$ (8.8)	(5.5)
Parent [Member] | Foreign Exchange Contract [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1],[3]						(0.7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	[1],[3]						0.2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	[1],[3]						$ (0.5)
[1]	Amounts in parentheses indicate charges to earnings. Amounts pertaining to noncontrolling interests are excluded.
[2]	Included in the computation of net periodic pension cost. See “Note 5. Retirement Plans” for additional details.
[3]	Included in other (expense) income, net.
[4]	Included in other income, net.

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 160.4	$ 223.2	$ 299.5	$ 1,358.3
Less: Distributed and undistributed income available to participating securities, Basic				(0.2)
Net income attributable to common stockholders, basic	160.4	223.2	299.5	1,358.1
Less: Distributed and undistributed income available to participating securities, Diluted				(0.2)
Net income attributable to common stockholders, diluted	$ 160.4	$ 223.2	$ 299.5	$ 1,358.1
Basic weighted average shares outstanding	256.6	256.1	255.7	255.5
Effect of dilutive stock options and non- participating securities	2.8	4.2	3.7	4.2
Diluted weighted average shares outstanding	259.4	260.3	259.4	259.7
Basic earnings per share attributable to common stockholders	$ 0.63	$ 0.87	$ 1.17	$ 5.32
Diluted earnings per share attributable to common stockholders	$ 0.62	$ 0.86	$ 1.15	$ 5.23

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.6	1.3	0.1