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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
ASSETS:    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative assets, Other assets  
TOTAL $ 19.9 $ 134.8
LIABILITIES:    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Derivative liabilities, Due to affiliates - less current portion
TOTAL 7.9 $ 31.0
Fair Value, Recurring    
ASSETS:    
Cash equivalents 16.8 5.6
Trust assets 0.2 0.1
Derivative instruments 2.9 129.1
LIABILITIES:    
Contingent obligation - net   0.0
Derivative instruments 7.9 31.0
Level 1    
ASSETS:    
TOTAL 17.0 5.7
LIABILITIES:    
TOTAL 0.0 0.0
Level 1 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 16.8 5.6
Trust assets 0.2 0.1
Derivative instruments 0.0 0.0
LIABILITIES:    
Contingent obligation - net   0.0
Derivative instruments 0.0 0.0
Level 2    
ASSETS:    
TOTAL 2.9 127.3
LIABILITIES:    
TOTAL 7.9 26.4
Level 2 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 2.9 127.3
LIABILITIES:    
Contingent obligation - net   0.0
Derivative instruments 7.9 26.4
Level 3    
ASSETS:    
TOTAL 0.0 1.8
LIABILITIES:    
TOTAL 0.0 4.6
Level 3 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 0.0 1.8
LIABILITIES:    
Contingent obligation - net   0.0
Derivative instruments $ 0.0 $ 4.6