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Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
The following tables summarize the carrying amounts, fair values and fair value measurements recorded or disclosed as of December 31, 2021 and 2022, based on the three levels established by ASC 820; Fair Value Measurements and Disclosures (in millions):
 Fair Value Measurements as of
December 31, 2021 using:
Assets (Liabilities)Carrying AmountFair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Commodity derivatives contracts
$(17.2)$(17.2)$(18.6)$1.4 $— 
Long-term receivables$10.1 $10.1 $— $— $10.1 
Contractual obligations$(11.3)$(11.3)$— $(1.5)$(9.8)
Debt$(5,088.8)$(5,711.5)$— $(5,711.5)$— 
 
 Fair Value Measurements as of
December 31, 2022 using:
Assets (Liabilities)Carrying AmountFair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Commodity derivatives contracts
$(8.9)$(8.9)$1.4 $(10.3)$— 
Long-term receivables$8.3 $8.3 $— $— $8.3 
Contractual obligations$(9.6)$(9.6)$— $— $(9.6)
Investment in Double Eagle$11.8 $11.8 $— $— $11.8 
Debt$(5,015.0)$(4,232.5)$— $(4,232.5)$—