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Capitalized Exploratory Well Costs
 12 Months Ended
Dec. 31, 2014
Capitalized Exploratory Well Costs [Abstract]  
Suspended Well Costs Disclosure [Text Block]

Net changes in capitalized exploratory well costs are presented in the table below. The balances at December 31, 2014, 2013 and 2012, represent the amount of capitalized exploratory well costs that are pending the determination of proved reserves.
 
2014
 
2013
 
2012
 
(in millions)
Balance at January 1,
$
2.6

 
$
2.1

 
$
5.0

Additions to capitalized exploratory well costs pending the determination of proved reserves
13.7

 
2.7

 
12.7

Reclassifications to proved properties after the determination of proved reserves
—

 
(2.2
)
 
(15.6
)
Capitalized exploratory well costs charged to expense
(3.7
)
 
—

 
—

Balance at December 31,
$
12.6

 
$
2.6

 
$
2.1