Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net cash provided by (used for) operating activities	$ 1,399.6	$ 1,135.6
Investing activities:
Capital expenditures	(976.8)	(665.5)
Cash paid related to business combinations, net of cash acquired	(3,368.3)	(188.2)
Cash receipts on sold trade receivables		346.1
Investment in unconsolidated entities	(10.4)	(111.1)
Proceeds from sale of property, plant and equipment	108.3	22.4
Proceeds from property, plant and equipment insurance settlement	16.5	6.2
Other	30.0	46.3
Net cash used for investing activities	(4,200.7)	(543.8)
Financing activities:
Proceeds from issuance of notes	2,498.2	1,197.3
(Repayments) additions to revolving credit facilities	47.7	0.3
Additions to debt	4,441.0	854.1
Repayments of debt	(4,665.0)	(2,022.7)
Changes in commercial paper, net	445.6
Other financing additions (repayments), net	13.2	(20.3)
Issuances of common stock, net of related minimum tax withholdings	8.6	23.2
Purchases of common stock	(88.6)	(100.8)
Cash dividends paid to stockholders	(350.7)	(329.7)
Cash distributions paid to noncontrolling interests	(3.4)	(26.6)
Other	(7.1)	6.0
Net cash provided by (used for) financing activities	2,339.5	(419.2)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	3.9	(24.0)
(Decrease) increase in cash, cash equivalents and restricted cash	(457.7)	148.6
Cash, cash equivalents and restricted cash at beginning of period	636.8	304.0
Cash, cash equivalents and restricted cash at end of period	179.1	452.6
Parent [Member]
Operating activities:
Net cash provided by (used for) operating activities	430.7	4.0
Investing activities:
Intercompany capital investment	(563.0)
Net cash used for investing activities	(563.0)
Financing activities:
Issuances of common stock, net of related minimum tax withholdings	8.6
Purchases of common stock	(88.6)
Cash dividends paid to stockholders	(350.7)
Intercompany capital receipt	563.0
Other		(4.0)
Net cash provided by (used for) financing activities	132.3	(4.0)
Issuer [Member]
Operating activities:
Net cash provided by (used for) operating activities	(512.4)	359.2
Investing activities:
Intercompany notes proceeds	9.2
Intercompany capital investment	(563.0)
Net cash used for investing activities	(553.8)
Financing activities:
Proceeds from issuance of notes	2,498.2	1,197.3
(Repayments) additions to revolving credit facilities	35.3	(106.7)
Additions to debt	4,101.8	2.7
Repayments of debt	(2,187.1)	(1,025.2)
Changes in commercial paper, net	445.6
Issuances of common stock, net of related minimum tax withholdings		23.2
Purchases of common stock		(100.8)
Cash dividends paid to stockholders		(329.7)
Intercompany notes payments	(3,800.0)
Other	(27.8)	(20.0)
Net cash provided by (used for) financing activities	1,066.0	(359.2)
(Decrease) increase 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	0.0
Guarantor Subsidiaries [Member]
Operating activities:
Net cash provided by (used for) operating activities	445.9	67.2
Investing activities:
Capital expenditures	(2.5)	(4.4)
Intercompany notes issued	(0.1)	(1.4)
Intercompany notes proceeds	4.3	3.9
Intercompany return of capital		82.6
Other	28.2	32.3
Net cash used for investing activities	29.9	113.0
Financing activities:
Additions to debt	(1.0)
Repayments of debt	(958.6)	(22.5)
Other financing additions (repayments), net		(7.3)
Intercompany notes borrowing	75.7
Intercompany notes payments	(70.2)
Net cash provided by (used for) financing activities	(954.1)	(29.8)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(0.1)
(Decrease) increase in cash, cash equivalents and restricted cash	(478.3)	150.3
Cash, cash equivalents and restricted cash at beginning of period	490.8	43.3
Cash, cash equivalents and restricted cash at end of period	12.5	193.6
Non-Guarantor Subsidiaries [Member]
Operating activities:
Net cash provided by (used for) operating activities	1,035.4	733.5
Investing activities:
Capital expenditures	(974.3)	(661.1)
Cash paid related to business combinations, net of cash acquired	(3,368.3)	(188.2)
Cash receipts on sold trade receivables		346.1
Investment in unconsolidated entities	(10.4)	(111.1)
Proceeds from sale of property, plant and equipment	108.3	22.4
Proceeds from property, plant and equipment insurance settlement	16.5	6.2
Intercompany notes issued	(75.7)
Intercompany notes proceeds	3,870.2
Other	1.8	14.0
Net cash used for investing activities	(431.9)	(571.7)
Financing activities:
(Repayments) additions to revolving credit facilities	12.4	107.0
Additions to debt	340.2	851.4
Repayments of debt	(1,519.3)	(975.0)
Other financing additions (repayments), net	13.2	(13.0)
Cash distributions paid to noncontrolling interests	(3.4)	(26.6)
Intercompany notes borrowing	0.1	1.4
Intercompany notes payments	(13.5)	(3.9)
Intercompany capital receipt	563.0
Intercompany capital distribution		(82.6)
Intercompany dividends		(28.3)
Other	20.7	30.0
Net cash provided by (used for) financing activities	(586.6)	(139.6)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	3.9	(23.9)
(Decrease) increase in cash, cash equivalents and restricted cash	20.8	(1.7)
Cash, cash equivalents and restricted cash at beginning of period	145.8	260.7
Cash, cash equivalents and restricted cash at end of period	166.6	259.0
Eliminations [Member]
Operating activities:
Net cash provided by (used for) operating activities		(28.3)
Investing activities:
Intercompany notes issued	75.8	1.4
Intercompany notes proceeds	(3,883.7)	(3.9)
Intercompany capital investment	1,126.0
Intercompany return of capital		(82.6)
Net cash used for investing activities	(2,681.9)	(85.1)
Financing activities:
Intercompany notes borrowing	(75.8)	(1.4)
Intercompany notes payments	3,883.7	3.9
Intercompany capital receipt	(1,126.0)
Intercompany capital distribution		82.6
Intercompany dividends		28.3
Net cash provided by (used for) financing activities	$ 2,681.9	$ 113.4