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Intangible Contract Assets and Liabilities Textuals (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Apr. 01, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Coal Supply Agreements
Asset impairment	$ 250.2	$ 20.0	$ 30.5	$ 0.0	$ 270.2	$ 0.0
Take-or-pay contracts
Take-or-Pay Contracts
Amortization Of Intangible Liabilities				22.5	16.6	26.6
Coal supply agreements
Coal Supply Agreements
Amortization of Intangible Assets				$ 121.3	23.2	$ 93.0
Asset impairment					$ 15.5
Scenario, Forecast | Take-or-pay contracts
Take-or-Pay Contracts
2020												$ 8.0
2021											$ 4.0
2022										$ 3.0
2023									$ 3.0
2024								$ 3.0
2025 and thereafter							$ 19.0
Scenario, Forecast | Coal supply agreements
Coal Supply Agreements
2020												$ 7.0
2021											$ 1.0
2022										$ 2.0
2023									$ 2.0
2024								$ 2.0
2025 and thereafter							$ 3.0

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