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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
ASSETS:    
Cash equivalents $ 23.3 $ 7.5
Trust assets 0.2 0.1
Surety bonds (3) 1.8 2.1
Derivative instruments 19.7 8.2
TOTAL 45.0 17.9
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 4.2 2.5
TOTAL 4.2 2.5
Level 1    
ASSETS:    
Cash equivalents 23.3 7.5
Trust assets 0.2 0.1
Surety bonds (3) 1.8 2.1
Derivative instruments 0.0 0.0
TOTAL 25.3 9.7
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
Level 2    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds (3) 0.0 0.0
Derivative instruments 9.1 3.2
TOTAL 9.1 3.2
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 1.3 2.0
TOTAL 1.3 2.0
Level 3    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds (3) 0.0 0.0
Derivative instruments 10.6 5.0
TOTAL 10.6 5.0
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 2.9 0.5
TOTAL $ 2.9 $ 0.5