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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
ASSETS:    
Cash equivalents $ 14.5 $ 7.5
Trust assets 1.1 0.1
Surety bonds 2.1 2.1
Derivative instruments 13.5 8.2
TOTAL 31.2 17.9
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 7.1 2.5
TOTAL 7.1 2.5
Fair Value, Inputs, Level 1 [Member]    
ASSETS:    
Cash equivalents 14.5 7.5
Trust assets 1.1 0.1
Surety bonds 2.1 2.1
Derivative instruments 0.0 0.0
TOTAL 17.7 9.7
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 6.3 3.2
TOTAL 6.3 3.2
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 4.1 2.0
TOTAL 4.1 2.0
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 7.2 5.0
TOTAL 7.2 5.0
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 3.0 0.5
TOTAL $ 3.0 $ 0.5