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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
ASSETS:    
TOTAL $ 57.1 $ 69.3
LIABILITIES:    
TOTAL 146.2 16.7
Fair Value, Recurring    
ASSETS:    
Cash equivalents 14.2 54.2
Trust assets 0.1 0.0
Derivative instruments 42.8 15.1
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 146.2 16.7
Level 1    
ASSETS:    
TOTAL 14.3 54.2
LIABILITIES:    
TOTAL 0.0 0.0
Level 1 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 14.2 54.2
Trust assets 0.1 0.0
Derivative instruments 0.0 0.0
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 0.0 0.0
Level 2    
ASSETS:    
TOTAL 42.6 12.1
LIABILITIES:    
TOTAL 140.9 16.7
Level 2 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 42.6 12.1
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 140.9 16.7
Level 3    
ASSETS:    
TOTAL 0.2 3.0
LIABILITIES:    
TOTAL 5.3 0.0
Level 3 | Fair Value, Recurring    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Derivative instruments 0.2 3.0
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments $ 5.3 $ 0.0