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v3.19.1

Financial Instruments and Other Guarantees - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Guarantee Obligations [Line Items] |  |  |  |
Surety Bonds outstanding | $ 1,571.3 |  | $ 1,571.3 |
Letters of credit outstanding, amount | 239.6 |  | 239.6 |
Asset retirement obligations | 691.8 |  | 691.8 | $ 686.4
Net interest expense | 35.8 | $ 36.3 |  |
Net impact on collateral requirements | 0.0 | 214.0 |  |
Provision for North Goonyella equipment loss | 24.7 | 0.0 |  | $ 66.4
Proceeds from Release of Collateral, Short-term and Long-term |  | 254.1 |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250.0 |  | 250.0 |
Secured Debt | Accounts Receivable Securitization Program, April 1, 2022 [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 0.0 |  | 0.0 |
Letters of credit drawn on, amount | 131.7 |  | 131.7 |
Cash collateral required | 0.0 |  | 0.0 |
Net interest expense | 1.1 | $ 1.3 |  |
U.S Mining |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Surety Bonds outstanding | 1,358.9 |  | 1,358.9 |
Letters of credit outstanding, amount | 147.3 |  | 147.3 |
Asset retirement obligations | $ 755.7 |  | 755.7 |
Leased Equipment |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Provision for North Goonyella equipment loss |  |  | $ 50.7 |

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