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Debt (Tables)
 9 Months Ended
Jun. 30, 2019
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):
 
Jun 30, 2019
 
Sep 30, 2018
 
Stated Interest Rate
Effective Interest Rate (1)
Issuance
Amount
Estimated Fair Value
 
Amount
Estimated Fair Value
 
2018 notes
$
—

$
—

 
$
350.0

$
350

 
2.000
%
2.012
%
2020 notes
500.0

499

 
500.0

490

 
2.200
%
2.228
%
2021 notes
500.0

499

 
500.0

489

 
2.100
%
2.293
%
2021 notes
250.0

249

 
250.0

244

 
2.100
%
1.600
%
2022 notes
500.0

506

 
500.0

486

 
2.700
%
2.819
%
2023 notes (2)
750.0

789

 
750.0

759

 
3.850
%
2.859
%
2023 notes
1,000.0

1,024

 
1,000.0

986

 
3.100
%
3.107
%
2024 notes (3)
788.5

791

 
748.4

743

 
0.372
%
0.462
%
2025 notes
1,250.0

1,334

 
1,250.0

1,249

 
3.800
%
3.721
%
2026 notes
500.0

494

 
500.0

451

 
2.450
%
2.511
%
2028 notes
600.0

630

 
600.0

576

 
3.500
%
3.529
%
2028 notes
750.0

815

 
750.0

754

 
4.000
%
3.958
%
2029 notes (4)
1,000.0

1,048

 
—

—

 
3.550
%
3.871
%
2045 notes
350.0

368

 
350.0

330

 
4.300
%
4.348
%
2047 notes
500.0

489

 
500.0

438

 
3.750
%
3.765
%
2048 notes
1,000.0

1,089

 
1,000.0

977

 
4.500
%
4.504
%
2049 notes (4)
1,000.0

1,101

 
—

—

 
4.450
%
4.433
%
Total
11,238.5

11,725

 
9,548.4

9,322

 
 
 
Aggregate debt issuance costs and unamortized premium/(discount), net
(85.2
)
 
 
(69.3
)
 
 
 
 
Hedge accounting fair value adjustment (2)
5.8

 
 
(39.0
)
 
 
 
 
Total
$
11,159.1

 
 
$
9,440.1

 
 
 
 
(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) 
Amount represents the change in fair value due to changes in benchmark interest rates related to our 2023 notes. Refer to Note 4, Derivative Instruments, for additional information on our interest rate swap designated as a fair value hedge.
(3) 
Japanese yen-denominated long-term debt.
(4) 
Issued in May 2019.
Long-Term Debt Maturities
The following table summarizes our long-term debt maturities as of June 30, 2019 by fiscal year (in millions):
Fiscal Year
Total
2020
$
—

2021
1,250.0

2022
500.0

2023
1,000.0

2024
1,538.5

Thereafter
6,950.0

Total
$
11,238.5