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Long-term Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Mar. 01, 2022
Debt Instrument [Line Items]
Debt issuance cost	$ 9.4		$ 9.8
Interest expense	18.4	$ 39.4
Net loss on early debt extinguishment	6.8	23.5
Finance lease obligations	25.0		23.6
Interest Paid, Capitalized, Investing Activities	19.1	37.2
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 92.6
8.500% Senior Secured Notes due December 20242 and 6.375% Senior Secured Notes due March 2025 [Domain]
Debt Instrument [Line Items]
Net loss on early debt extinguishment		23.0
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Stated interest rate	3.25%
Long-term debt	$ 320.0		$ 320.0
Principal amount				$ 320.0
Debt Issuance Costs, Gross		11.2
Senior Notes | 6.375% Senior Secured Notes due March 2025 (2025 Notes)
Debt Instrument [Line Items]
Debt repurchase, amount		257.4
Senior Notes | 8.500% Senior Secured Notes due December 2024 (2024 Peabody Notes)
Debt Instrument [Line Items]
Debt repurchase, amount		$ 62.6

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