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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
ASSETS:    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative assets, Other assets  
TOTAL $ 134.8 $ 57.1
LIABILITIES:    
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Derivative liabilities, Other Liabilities, Noncurrent
TOTAL 31.0 $ 146.2
Fair Value, Recurring    
ASSETS:    
Cash equivalents 5.6 14.2
Trust assets 0.1 0.1
Derivative instruments 129.1 42.8
LIABILITIES:    
Contingent obligation - net 0.0 0.0
Derivative instruments 31.0 146.2
Level 1    
ASSETS:    
TOTAL 5.7 14.3
LIABILITIES:    
TOTAL 0.0 0.0
Level 1 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 5.6 14.2
Trust assets 0.1 0.1
Derivative instruments 0.0 0.0
LIABILITIES:    
Contingent obligation - net 0.0 0.0
Derivative instruments 0.0 0.0
Level 2    
ASSETS:    
TOTAL 127.3 42.6
LIABILITIES:    
TOTAL 26.4 140.9
Level 2 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 127.3 42.6
LIABILITIES:    
Contingent obligation - net 0.0 0.0
Derivative instruments 26.4 140.9
Level 3    
ASSETS:    
TOTAL 1.8 0.2
LIABILITIES:    
TOTAL 4.6 5.3
Level 3 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 1.8 0.2
LIABILITIES:    
Contingent obligation - net 0.0 0.0
Derivative instruments $ 4.6 $ 5.3