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Other Income (Tables)
 12 Months Ended
Dec. 31, 2015
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Other income for the years ended December 31 consists of the following ($ in millions):
 
2015
 
2014
 
2013
Gain on sale of marketable equity securities
$
12.4

 
$
122.6

 
$
201.5

Gain on sale of unconsolidated joint venture
—

 
—

 
229.8

Gain on sale of a product line
—

 
33.9

 
—

Total
$
12.4

 
$
156.5

 
$
431.3