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Intangible Contract Assets and Liabilities - Textuals (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Coal supply agreements
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Presented periods amortization	$ 2.4	$ 4.8
Take-or-pay contracts
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Presented periods amortization	$ 2.6	$ 5.6
Scenario, Forecast | Coal supply agreements
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2020								$ 5.0
2021							$ 1.0
2022						$ (2.0)
2023					$ 2.0
2024				$ 2.0
2025 and thereafter			$ 3.0
Scenario, Forecast | Take-or-pay contracts
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2020								$ 5.0
2021							$ 4.0
2022						$ 3.0
2023					$ 2.0
2024				$ 3.0
2025 and thereafter			$ 16.0

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- Definition

Amortization Of Intangible Liabilities

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Finite-Lived Intangible Liabilities, Amortization Expense, Beyond Five Years

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Finite-Lived Intangible Liabilities, Amortization Expense, Remainder of Fiscal Year

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Five

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Four

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Three

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Two

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Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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