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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
ASSETS:    
Cash equivalents $ 14.3 $ 7.5
Trust assets 0.1 0.1
Surety bonds 2.1 2.1
Derivative instruments 8.9 8.2
TOTAL 25.4 17.9
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 8.8 2.5
TOTAL 8.8 2.5
Fair Value, Inputs, Level 1 [Member]    
ASSETS:    
Cash equivalents 14.3 7.5
Trust assets 0.1 0.1
Surety bonds 2.1 2.1
Derivative instruments 0.0 0.0
TOTAL 16.5 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 5.2 3.2
TOTAL 5.2 3.2
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 5.2 2.0
TOTAL 5.2 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 3.7 5.0
TOTAL 3.7 5.0
LIABILITIES:    
Contingent obligation – net 0.0 0.0
Derivative instruments 3.6 0.5
TOTAL $ 3.6 $ 0.5