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Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
ASSETS:    
Cash equivalents $ 2.8 $ 7.9
Trust assets 1.1 0.3
Derivative instruments 4.6 4.5
TOTAL 8.5 12.7
LIABILITIES:    
Derivative instruments 19.8 4.4
TOTAL 19.8 4.4
Level 1    
ASSETS:    
Cash equivalents 2.8 7.9
Trust assets 1.1 0.3
Derivative instruments 0.0 0.0
TOTAL 3.9 8.2
LIABILITIES:    
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
Level 2    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 4.6 4.5
TOTAL 4.6 4.5
LIABILITIES:    
Derivative instruments 19.8 4.4
TOTAL 19.8 4.4
Level 3    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
LIABILITIES:    
Derivative instruments 0.0 0.0
TOTAL $ 0.0 $ 0.0