Derivative Instruments - Gains (Losses) on Trading Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Forward Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains	$ 8.3	$ 16.1	$ 6.5
Unrealized gains (losses)	0.2	(0.4)	0.0
Total	8.5	15.7	6.5
Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains	(1.9)	13.5	3.3
Unrealized gains (losses)	2.3	(18.5)	16.2
Total	$ 0.4	$ (5.0)	$ 19.5

Derivative Instruments Not Designated As Hedging Instruments, Realized Gain (Loss)

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- Definition

Derivative Instruments Not Designated as Hedging Instruments, Unrealized Gain (Loss)

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC

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