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Coal Trading - Fair Value (Details) - Coal Trading - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Successor | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options					$ 0.2	$ (7.2)
Physical purchase/sale contracts					2.2	(1.9)
Total net financial assets (liabilities)					2.4	(9.1)
Successor | Level 1 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options					0.2	(3.0)
Physical purchase/sale contracts					0.0	0.0
Total net financial assets (liabilities)					0.2	(3.0)
Successor | Level 2 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options					0.0	(4.2)
Physical purchase/sale contracts					2.2	(1.9)
Total net financial assets (liabilities)					2.2	(6.1)
Successor | Level 3 | Fair Value, Measurements, Recurring
Fair value coal trading net assets (liabilities) measured on recurring basis:
Futures, swaps and options					0.0	0.0
Physical purchase/sale contracts					0.0	0.0
Total net financial assets (liabilities)					$ 0.0	$ 0.0
Scenario, Forecast | Level 3
Fair value coal trading net assets (liabilities) measured on recurring basis:
Estimated Future Realization of Trading Portfolio	100.00%	(8.00%)	25.00%	83.00%

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