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Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Capitalized software costs, net of accumulated amortization $ 8.4 $ 15.6
Grantor trust assets 7.5 6.2
Net pension assets 31.2 31.0
Long-term supplies inventory 5.9 4.6
Hedge contracts assets 10.9 39.2
Other assets 17.9 13.5
Total $ 81.8 $ 110.1