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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
ASSETS:    
Cash equivalents $ 5.8 $ 5.6
Trust assets 1.1 0.1
Derivative instruments 37.9 129.1
TOTAL 44.8 134.8
LIABILITIES:    
Derivative instruments (6.1) 31.0
TOTAL (6.1) 31.0
Level 1    
ASSETS:    
Cash equivalents 5.8 5.6
Trust assets 1.1 0.1
Derivative instruments 0.0 0.0
TOTAL 6.9 5.7
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 37.9 127.3
TOTAL 37.9 127.3
LIABILITIES:    
Derivative instruments (6.1) 26.4
TOTAL (6.1) 26.4
Level 3    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 0.0 1.8
TOTAL 0.0 1.8
LIABILITIES:    
Derivative instruments 0.0 4.6
TOTAL $ 0.0 $ 4.6