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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
ASSETS:    
Cash equivalents $ 11.7 $ 16.8
Trust assets 1.6 0.2
Derivative instruments 5.3 2.9
TOTAL 18.6 19.9
LIABILITIES:    
Derivative instruments 3.8 7.9
TOTAL 3.8 7.9
Level 1    
ASSETS:    
Cash equivalents 11.7 16.8
Trust assets 1.6 0.2
Derivative instruments 0.0 0.0
TOTAL 13.3 17.0
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 5.3 2.9
TOTAL 5.3 2.9
LIABILITIES:    
Derivative instruments 3.8 7.9
TOTAL 3.8 7.9
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