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Supplementary Financial Information- Schedule of Other Income (Expense), Net (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Offsetting Assets [Line Items]    
Loss on debt extinguishment $ (2.2) $ 0.0
Total (1.2) 16.5
HMN    
Offsetting Assets [Line Items]    
Gain on sale of investment 0.0 12.3
Gain on step-up of equity method investment 0.0 3.8
Loss on debt extinguishment (2.2) 0.0
Other 1.0 0.4
Total $ (1.2) $ 16.5