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Commitments and Contingencies and Derivative Financial Instruments (Details) $ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2023 USD ($) | Apr. 12, 2022 USD ($) | Apr. 12, 2022 AUD ($) | Apr. 01, 2022 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) derivative_agreement | Sep. 28, 2012 MW | Dec. 22, 2008 case
JKC Australia LNG Pty Limited |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Settlement payment |  | $ 475.0 |  |  |  |  |  |
UGL Infrastructure Pty Limited | Consortium Agreement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  |  |  |  |  | 50.00% |
General Electric and GE Electrical International Inc |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  | 360 |
Settlement payment |  |  | $ 640 |  |  |  |  |
Litigation expenses included in segment profit |  |  |  | $ 91.3 |  |  |  |
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending claims | case |  |  |  |  |  |  |  | 10
LOCs |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  |  |  | $ 326.2 | $ 280.5 |  |
Surety Bond |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  |  |  | 2,000.0 | $ 2,200.0 |  |
Treasury Lock |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of instruments held | derivative_agreement |  |  |  |  |  | 2 |  |
Derivative notional amount |  |  |  |  |  | $ 500.0 |  |
Gain on derivatives, before taxes | $ 37.4 |  |  |  |  |  |  |
Derivative assets (liabilities), at fair value |  |  |  |  |  | 40.9 |  |
Unrealized gain (loss) on derivatives |  |  |  |  | 27.2 | 30.8 |  |
Treasury Lock | Fixed Rate Date |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 500.0 |  |  |  |  | 500.0 |  |
Interest Rate Swap and Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Derivative assets (liabilities), at fair value |  |  |  |  | 107.4 | 128.2 |  |
Unrealized gain (loss) on derivatives |  |  |  |  | 81.5 | 87.5 |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | 778.9 |  |  |
Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 127.8 |  |  |
Cross Currency Interest Rate Contract | Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  | 3 years 6 months |  |  |
Cross Currency Interest Rate Contract | Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  | 10 years |  |  |
Foreign Exchange Forward |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 829.3 | 298.2 |  |
Derivative assets (liabilities), at fair value |  |  |  |  | $ 15.9 | $ (3.2) |  |
Foreign Exchange Forward | Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  | 1 month |  |  |
Foreign Exchange Forward | Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  | 12 months |  |  |

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