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Other Income (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Other income for the years ended December 31 consist of the following ($ in millions):
 
 
2014
 
2013
 
2012
Gain on sale of marketable equity securities
$
122.6

 
$
201.5

 
$
—

Gain on sale of joint venture
—

 
229.8

 
—

Gain on sale of a product line
33.9

 
—

 
—

Total
$
156.5

 
$
431.3

 
$
—