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EXCEL - IDEA: XBRL DOCUMENT - MPLX LPFinancial_Report.xls
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v2.4.0.6
Combined Statements of Net Investment (Unaudited) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Predecessor [Member]
       
Net Investment:        
Balance at beginning of period     $ 1,239.2 $ 1,068.2
Net income 36.9 39.3 101.9 109.3
Contributions from (distributions to) MPC, net     (165.5) 17.2
Balance at end of period $ 1,175.6 $ 1,194.7 $ 1,175.6 $ 1,194.7