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EXCEL - IDEA: XBRL DOCUMENT - MPLX LPFinancial_Report.xls
10-Q - 10-Q - MPLX LPd431387d10q.htm
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v2.4.0.6
Property, Plant and Equipment (Summary of Property, Plant and Equipment) (Detail) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Total $ 1,334.2 $ 1,240.8
Less accumulated depreciation 375.9 374.0
Net property, plant and equipment 958.3 866.8
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Total 5.2 5.2
Pipelines and related assets [Member]
   
Property, Plant and Equipment [Line Items]    
Total 1,202.6 1,104.4
Tanks and delivery facilities [Member]
   
Property, Plant and Equipment [Line Items]    
Total 77.1 74.6
Other [Member]
   
Property, Plant and Equipment [Line Items]    
Total 10.5 10.3
Asset under Construction [Member]
   
Property, Plant and Equipment [Line Items]    
Total $ 38.8 $ 46.3