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Property, Plant and Equipment Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 
March 31,
2015
 
December 31,
2014
 
(millions)
Property, plant and equipment, gross
$
3.7

 
$
3.7

Accumulated depreciation
(0.3
)
 
(0.2
)
Property, plant and equipment, net
$
3.4

 
$
3.5