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Financial Instruments: Derivatives and Hedging (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
derivative
Financial Instruments: Derivatives and Hedging      
Fair value of derivatives in a net liability position $ 17.5    
Aggregate termination value 18.3    
Interest Rate Cap      
Financial Instruments: Derivatives and Hedging      
Loss from changes in fair value 10.4 $ 1.7  
Derivative, number of instruments sold | derivative     0
Interest Expense      
Financial Instruments: Derivatives and Hedging      
Loss from changes in fair value 0.2 $ 0.3 $ 0.0
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months (32.5)    
Income Loss From Equity Method Investments      
Financial Instruments: Derivatives and Hedging      
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months $ (7.6)