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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligations satisfied in prior period, amount recognized | $ 0.0 | $ 0.0 | $ 1.4 | $ 2.1
Revenue recognized in contract liability | 0.3 | $ 0.2 | 0.7 | $ 0.7
Contract assets recognized | $ 0.0 |  | 0.0 |
Sawtooth Mining, LLC | Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Equipment acquired |  |  | $ 23.1 |
Minimum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Primary term of contract |  |  | 3 years |
Maximum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Primary term of contract |  |  | 5 years |
Maximum | Sawtooth Mining, LLC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Capital expenditures |  |  | $ 50.0 |

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