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Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
ASSETS:    
Cash equivalents $ 89.3 $ 23.3
Trust assets 1.3 0.2
Surety bonds 1.9 1.8
Derivative instruments 58.3 19.7
TOTAL 150.8 45.0
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 39.3 4.2
TOTAL 39.3 4.2
Fair Value, Inputs, Level 1 [Member]    
ASSETS:    
Cash equivalents 89.3 23.3
Trust assets 1.3 0.2
Surety bonds 1.9 1.8
Derivative instruments 0.0 0.0
TOTAL 92.5 25.3
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds 0.0 0.0
Derivative instruments 50.5 9.1
TOTAL 50.5 9.1
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 36.1 1.3
TOTAL 36.1 1.3
Fair Value, Inputs, Level 3 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds 0.0 0.0
Derivative instruments 7.8 10.6
TOTAL 7.8 10.6
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 3.2 2.9
TOTAL $ 3.2 $ 2.9