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Significant Accounting Policies - (Gain) Loss on Disposition of Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Net book value of assets disposed $ 72.9 $ 30.8 $ 3.3
Proceeds from sales (73.1) (12.8) (4.8)
Insurance recoveries (0.1) 0.0 0.0
(Gain) loss on disposition of assets $ (0.3) $ 18.0 $ (1.5)