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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
ASSETS:    
Cash equivalents $ 162.2 $ 23.3
Trust assets 0.8 0.2
Surety bonds   1.8
Derivative instruments 34.6 19.7
TOTAL 197.6 45.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 15.7 4.2
TOTAL 15.7 4.2
Level 1 [Member]    
ASSETS:    
Cash equivalents 162.2 23.3
Trust assets 0.8 0.2
Surety bonds   1.8
Derivative instruments 0.0 0.0
TOTAL 163.0 25.3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 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
Derivative instruments 28.5 9.1
TOTAL 28.5 9.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 14.2 1.3
TOTAL 14.2 1.3
Level 3 [Member]    
ASSETS:    
Cash equivalents 0.0 0.0
Trust assets 0.0 0.0
Surety bonds   0.0
Derivative instruments 6.1 10.6
TOTAL 6.1 10.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Contingent obligation – net 0.0 0.0
Derivative instruments 1.5 2.9
TOTAL $ 1.5 $ 2.9