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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment (and related depreciable lives) consisted of the following ($ in millions):
 
December 31,
 
2016
 
2015
Land and improvements
$
11.2

 
$
11.5

Buildings and improvements (20 to 40 years or remaining life of relevant lease)
118.5

 
117.5

Machinery and equipment (5 to 20 years)
526.1

 
513.0

Construction in progress
28.3

 
20.8

Gross property, plant and equipment
684.1

 
662.8

Less: Accumulated depreciation
376.7

 
354.7

Property, plant and equipment, net
$
307.4

 
$
308.1