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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Schedule of Other Operating Cost and Expense, by Component "Other income (expense), net," as reported in the Consolidated Statements of Operations, consisted of the following:
 
 
Year Ended December 31,
 ($ amounts in millions)
 
2018
 
2017
 
2016
Loss on debt extinguishment
 
$
(0.4
)
 
$
(72.3
)
 
$
(11.3
)
Gain (loss) on derivative contracts
 
0.4

 
(1.8
)
 
(4.9
)
Gain on sale of equity investment
 
11.3

 
—

 
—

Gain on legal settlement
 
—

 
10.8

 
—

Gain on settlement agreement related to Series B Convertible Preferred Stock
 
—

 
—

 
103.0

Non-cash change in fair value of preferred stock redemption liability
 
—

 
—

 
(5.0
)
Other income (expense), net
 
3.5

 
(6.7
)
 
3.8

Total
 
$
14.8

 
$
(70.0
)
 
$
85.6