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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
ASSETS:    
Cash equivalents $ 3.8 $ 14.2
Trust assets 1.0 0.1
Derivative instruments 175.3 42.8
TOTAL 180.1 57.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 69.3 146.2
TOTAL 69.3 146.2
Level 1 [Member]    
ASSETS:    
Cash equivalents 3.8 14.2
Trust assets 1.0 0.1
Derivative instruments 0.0 0.0
TOTAL 4.8 14.3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
Level 2 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 173.7 42.6
TOTAL 173.7 42.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 65.5 140.9
TOTAL 65.5 140.9
Level 3 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 1.6 0.2
TOTAL 1.6 0.2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 3.8 5.3
TOTAL $ 3.8 $ 5.3