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Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
ASSETS:    
Cash equivalents $ 15.4 $ 7.5
Trust assets 0.7 0.1
Surety bonds 1.8 2.1
Derivative instruments 21.8 8.2
TOTAL 39.7 17.9
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 5.3 2.5
TOTAL 5.3 2.5
Fair Value, Inputs, Level 1 [Member]    
ASSETS:    
Cash equivalents 15.4 7.5
Trust assets 0.7 0.1
Surety bonds 1.8 2.1
Derivative instruments 0.0 0.0
TOTAL 17.9 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 6.1 3.2
TOTAL 6.1 3.2
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 3.8 2.0
TOTAL 3.8 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 15.7 5.0
TOTAL 15.7 5.0
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 1.5 0.5
TOTAL $ 1.5 $ 0.5