Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Schedule of Changes In Accumulated Other Comprehensive Income Loss

Changes in accumulated other comprehensive income (loss) by component for the three and six-month periods ended June 30, 2013 were as follows (in millions):

	Cash Flow Hedges			Foreign Currency Items			Total
For the Three Months Ended June 30, 2013
Beginning balance, net of tax	$	10.5		$	—		$	10.5
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		30.0			—			30.0
Foreign currency translations		—			(0.5	)		(0.5	)
Income tax effect		(10.8	)		—			(10.8	)
Net of tax		19.2			(0.5	)		18.7
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		(7.3	)		—			(7.3	)
Income tax effect		2.6			—			2.6
Net of tax		(4.7	)		—			(4.7	)
Other comprehensive income (loss), net of tax		14.5			(0.5	)		14.0
Ending balance, net of tax	$	25.0			($0.5	)	$	24.5
For the Six Months Ended June 30, 2013
Beginning balance, net of tax	$	28.8		$	—		$	28.8
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		9.9			—			9.9
Foreign currency translations		—			(0.5	)		(0.5	)
Income tax effect		(3.5	)		—			(3.5	)
Net of tax		6.4			(0.5	)		5.9
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		(15.9	)		—			(15.9	)
Income tax effect		5.7			—			5.7
Net of tax		(10.2	)		—			(10.2	)
Other comprehensive income (loss), net of tax		(3.8	)		(0.5	)		(4.3	)
Ending balance, net of tax	$	25.0			($0.5	)	$	24.5

In 2012, the only component of accumulated other comprehensive income related to our cash flow hedges. Changes in accumulated other comprehensive income (loss) for the three and six-month periods ended June 30, 2012 were as follows (in millions):

	Cash Flow Hedges
For the Three Months Ended June 30, 2012
Beginning balance, net of tax		($0.2	)
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		108.1
Income tax effect		(38.9	)
Net of tax		69.2
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		(9.4	)
Income tax effect		3.4
Net of tax		(6.0	)
Other comprehensive income, net of tax		63.2
Ending balance, net of tax	$	63.0
For the Six Months Ended June 30, 2012
Beginning balance, net of tax	$	21.9
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		72.6
Income tax effect		(26.1	)
Net of tax		46.5
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		(8.4	)
Income tax effect		3.0
Net of tax		(5.4	)
Other comprehensive income, net of tax		41.1
Ending balance, net of tax	$	63.0