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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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