Debt (Summary of Outstanding Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Short-term borrowings	$ 7.7	$ 58.2
Current portion of long-term debt	470.0	40.4
Long-term debt	7,132.9	2,907.3
Long-term debt – related party	297.2	320.1
Total Debt	$ 7,907.8	$ 3,326.0
Short-term debt, weighted average interest rate	1.60%	3.70%
Current portion of long-term debt due to related party	$ 41.3	$ 37.8

Amount of short-term and long-term debt and lease obligation.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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