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Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
ASSETS:
Cash equivalents	$ 0.1	$ 54.2
Trust assets	1.0	0.0
Derivative instruments	29.1	15.1
TOTAL	30.2	69.3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	157.0	16.7
TOTAL	157.0	16.7
Level 1 [Member]
ASSETS:
Cash equivalents	0.1	54.2
Trust assets	1.0	0.0
Derivative instruments	0.0	0.0
TOTAL	1.1	54.2
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
Derivative instruments	27.6	12.1
TOTAL	27.6	12.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	138.7	16.7
TOTAL	138.7	16.7
Level 3 [Member]
ASSETS:
Cash equivalents	0.0	0.0
Trust assets	0.0	0.0
Derivative instruments	1.5	3.0
TOTAL	1.5	3.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	18.3	0.0
TOTAL	$ 18.3	$ 0.0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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