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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
ASSETS:
Cash equivalents	$ 10.9	$ 14.2
Trust assets	1.5	0.1
Derivative instruments	84.7	42.8
TOTAL	97.1	57.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	223.5	146.2
TOTAL	223.5	146.2
Level 1 [Member]
ASSETS:
Cash equivalents	10.9	14.2
Trust assets	1.5	0.1
Derivative instruments	0.0	0.0
TOTAL	12.4	14.3
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
Derivative instruments	84.7	42.6
TOTAL	84.7	42.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	206.8	140.9
TOTAL	206.8	140.9
Level 3 [Member]
ASSETS:
Cash equivalents	0.0	0.0
Trust assets	0.0	0.0
Derivative instruments	0.0	0.2
TOTAL	0.0	0.2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Contingent obligation – net	0.0	0.0
Derivative instruments	16.7	5.3
TOTAL	$ 16.7	$ 5.3

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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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