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v3.23.3

Other Events Narrative (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 25, 2023 USD ($) | Oct. 02, 2023 USD ($) | Oct. 27, 2023 USD ($) shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2022 AUD ($)
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 1,078,900,000 | $ 1,342,500,000 | $ 3,711,700,000 | $ 3,355,800,000 |
Other Noncash Income |  |  |  |  |  | 9,400,000 | 0 |
Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer |  |  |  |  |  |  |  | $ 30.0
Revenue related to excess port and rail capacity agreement |  |  |  |  |  | 19,200,000 |  |
Common stock repurchase amount including commission fees |  |  |  | 82,400,000 |  | 266,600,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 733,600,000 |  | $ 733,600,000 |  |
Stock Repurchased During Period, Shares | shares |  |  |  | 3,700,000 |  | 12,600,000 |  |
Subsequent Event |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Common stock repurchase amount including commission fees |  |  | $ 27,300,000 |  |  |  |  |
Stock Repurchased During Period, Shares | shares |  |  | 1,100,000 |  |  |  |  |
Unsettled common stock repurchases |  | $ 2,600,000 |  |  |  |  |  |
Subsequent Event | Wards Well coal deposit |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Asset Acquisition, Price of Acquisition, Expected | $ 136,000,000 |  |  |  |  |  |  |
Contingent royalty | $ 200,000,000 |  |  |  |  |  |  |
Treasury Stock, Common |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Sales and Excise Tax Payable |  |  |  | $ 900,000 | 0 | $ 2,500,000 | 0 |
Unsettled common stock repurchases |  |  |  | (8,600,000) | $ 0 | 2,600,000 | $ 0 |
North Antelope Rochelle Mine |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Storm Damage Provision |  |  |  | $ 3,300,000 |  | 8,300,000 |  |
North Antelope Rochelle Mine | Materials and supplies inventories |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Storm Damage Provision |  |  |  |  |  | 4,000,000 |  |
North Antelope Rochelle Mine | Buildings and equipment |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Storm damage provision for buildings and equipment |  |  |  |  |  | 1,000,000 |  |
North Antelope Rochelle Mine | Incremental repair costs |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Storm Damage Provision |  |  |  |  |  | 3,300,000 |  |
Shoal Creek Mine |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Business interruption and property loss limits on insurance claim, amount |  |  |  |  |  | 125,000,000 |  |
Provision for loss related to fire |  |  |  |  |  | 28,700,000 |  |
Deductible amount |  |  |  |  |  | 50,000,000 |  |
Shoal Creek Mine | Longwall and development and other costs |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Provision for loss related to fire |  |  |  |  |  | 17,800,000 |  |
Shoal Creek Mine | Equipment deemed inoperable |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Provision for loss related to fire |  |  |  |  |  | $ 10,900,000 |  |

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