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Discontinued Operations - Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Non-cash add-backs to cash flows from discontinued operating activities:      
Depreciation $ 0.1 $ 0.1 $ 0.5
Impairment charges 0.0 0.0 1.5
Settlements from sale of businesses 0.0 1.0 0.0
Capital expenditures $ 0.1 $ 0.1 $ 0.1