Debt (Tables)

3 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Components of Long-Term Debt Including Associated Interest Rates and Related Estimated Fair Values

Components of long-term debt including the associated interest rates and related estimated fair values by calendar maturity (in millions, except interest rates):

	Dec 31, 2017				Oct 1, 2017				Stated Interest Rate		Effective Interest Rate (1)
Issuance	Amount			Estimated Fair Value	Amount			Estimated Fair Value
2018 notes	350.0			350	350.0			352	2.000	%	2.012	%
2020 notes(2)	500.0			500	—			—	2.200	%	2.228	%
2021 notes	500.0			497	500.0			501	2.100	%	2.293	%
2021 notes	250.0			248	250.0			250	2.100	%	1.600	%
2022 notes	500.0			504	500.0			508	2.700	%	2.819	%
2023 notes	750.0			796	750.0			806	3.850	%	2.859	%
2024 notes (3)	755.3			762	755.3			760	0.372	%	0.462	%
2026 notes	500.0			480	500.0			481	2.450	%	2.511	%
2045 notes	350.0			387	350.0			381	4.300	%	4.348	%
2047 notes(2)	500.0			509	—			—	3.750	%	3.765	%
Total	4,955.3			5,033	3,955.3			4,039
Aggregate debt issuance costs and unamortized premium, net	(26.1		)		(17.5		)
Hedge accounting fair value adjustment (4)	(12.8		)		(5.2		)
Total	$	4,916.4			$	3,932.6

⁽¹⁾  Includes the effects of the amortization of any premium or discount and any gain or loss upon settlement of related treasury locks or forward-starting interest rate swaps utilized to hedge the interest rate risk prior to the debt issuance.

⁽²⁾  Issued in November 2017.

⁽³⁾  Japanese yen-denominated long-term debt.

⁽⁴⁾  Amount represents the change in fair value due to changes in benchmark interest rates related to our 2023 notes. Refer to Note 3, Derivative Financial Instruments, for additional information on our interest rate swap designated as a fair value hedge.

Long-Term Debt Maturities

The following table summarizes our long-term debt maturities as of December 31, 2017 by fiscal year (in millions):

Fiscal Year	Total
2019	$	350.0
2020	—
2021	1,250.0
2022	500.0
2023	—
Thereafter	2,855.3
Total	$	4,955.3