Capitalized Exploratory Well Costs

12 Months Ended

Dec. 31, 2013

Capitalized Exploratory Well Costs [Abstract]

Suspended Well Costs Disclosure [Text Block]

Net changes in capitalized exploratory well costs are presented in the table below and exclude amounts that were capitalized and subsequently expensed in the period. The balances at December 31, 2013, 2012 and 2011, represent the amount of capitalized exploratory well costs that are pending the determination of proved reserves.

	2013			2012			2011
	(in millions)
Balance at January 1,	$	2.1		$	5.0		$	13.6
Additions to capitalized exploratory well costs pending the determination of proved reserves	2.7			12.7			—
Reclassifications to proved properties after the determination of proved reserves	(2.2		)	(15.6		)	(8.3		)
Capitalized exploratory well costs charged to expense	—			—			(0.3		)
Balance at December 31,	$	2.6		$	2.1		$	5.0