Income Tax Expense (Tables)

9 Months Ended

Sep. 30, 2013

Income Tax Expense [Abstract]

Income Tax Expense [Table Text Block]

	Quarter Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Millions
Current Tax Expense (Benefit)
Federal (a)	—			—			—			—
State (a)	$(0.1)			—			$(0.1)			—
Total Current Tax Expense (Benefit)	(0.1)			—			(0.1)			—
Deferred Tax Expense (Benefit)
Federal		$7.3			$10.1			$15.5			$23.3
State (b)	1.7			0.4			5.5			0.7
Investment Tax Credit Amortization	(0.2		)	(0.2		)	(0.6		)	(0.6		)
Total Deferred Tax Expense	8.8			10.3			20.4			23.4
Total Income Tax Expense		$8.7			$10.3			$20.3			$23.4

(a) We incurred net operating losses (NOLs) due to the bonus depreciation provisions of the American Taxpayer Relief Act of 2012 and the Tax Relief Unemployment Insurance Reauthorization and Job Creation Act of 2010 for the quarter and nine months ended September 30, 2013 and 2012. The 2013 and 2012 federal and state NOLs will be carried forward to offset future taxable income.

(b) The quarter and nine months ended September 30, 2012 reflected increased state tax benefit from state renewable tax credits compared to the quarter and nine months ended September 30, 2013.