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Property, Plant and Equipment - Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation [Roll Forward]    
Beginning obligation $ 200.4 $ 184.5
Accretion 10.3 9.5
Liabilities Recognized   7.8
Liabilities Settled (10.2) (4.4)
Revisions in Estimated Cash Flows 2.4 3.0
Ending obligation $ 202.9 $ 200.4