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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
ASSETS:    
Cash equivalents $ 7.5 $ 142.8
Trust assets 0.1 1.8
Surety bonds 2.1 1.6
Derivative instruments 8.2 1.7
TOTAL 17.9 147.9
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 2.5 1.2
TOTAL 2.5 1.2
Level 1 [Member]    
ASSETS:    
Cash equivalents 7.5 142.8
Trust assets 0.1 1.8
Surety bonds 2.1 1.6
Derivative instruments 0.0 0.0
TOTAL 9.7 146.2
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 0.0 0.0
TOTAL 0.0 0.0
Level 2 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds 0.0 0.0
Derivative instruments 3.2 0.0
TOTAL 3.2 0.0
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 2.0 0.0
TOTAL 2.0 0.0
Level 3 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds 0.0 0.0
Derivative instruments 5.0 1.7
TOTAL 5.0 1.7
LIABILITIES:    
Contingent obligation 0.0 0.0
Derivative instruments 0.5 1.2
TOTAL $ 0.5 $ 1.2