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Discontinued Operations (Tables)
9 Months Ended
Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Disposal Groups, Including Discontinued Operations [Table Text Block]
The following table summarizes the revenues, operating costs, other expenses and income tax of discontinued operations for the periods indicated:
Three months endedNine months ended
September 30,September 30,
$ in millions2021202020212020
Revenues$ $0.9 $1.4 $23.3 
Operating costs and other expenses 0.5 (2.4)(23.9)
Loss from discontinued operations before income tax 1.4 (1.0)(0.6)
Gain from disposal of discontinued operations —  4.5 
Income tax expense / (benefit) from discontinued operations 0.3 (0.2)0.8 
Net income / (loss) from discontinued operations$ $1.1 $(0.8)$3.1