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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
ASSETS:    
Cash equivalents $ 26.5 $ 54.2
Trust assets 0.6 0.0
Derivative instruments 42.2 15.1
TOTAL 69.3 69.3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 203.6 16.7
TOTAL 203.6 16.7
Level 1 [Member]    
ASSETS:    
Cash equivalents 26.5 54.2
Trust assets 0.6 0.0
Derivative instruments 0.0 0.0
TOTAL 27.1 54.2
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 42.2 12.1
TOTAL 42.2 12.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 188.1 16.7
TOTAL 188.1 16.7
Level 3 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 0.0 3.0
TOTAL 0.0 3.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 15.5 0.0
TOTAL $ 15.5 $ 0.0