Income Tax Expense (Tables)

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Tax Expense [Table Text Block]

	Quarter Ended					Nine Months Ended
	September 30,					September 30,
	2016		2015			2016			2015
Millions
Current Tax Expense (a)
Federal	—		—			—			—
State	—		$0.2				$0.2		$0.5
Total Current Tax Expense	—		$0.2				$0.2		$0.5
Deferred Tax Expense
Federal	$0.4			$14.8		$7.1				$23.5
State	1.4		(0.4		)	8.9			3.6
Investment Tax Credit Amortization	(0.1	)	(0.2		)	(0.5		)	(0.6		)
Total Deferred Tax Expense	$1.7			$14.2		$15.5				$26.5
Total Income Tax Expense	$1.7			$14.4		$15.7				$27.0

(a) For the nine months ended September 30, 2016, and 2015, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of the Protecting Americans from Tax Hikes Act of 2015, the Tax Increase Prevention Act of 2014 and the American Taxpayer Relief Act of 2012.

Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Table Text Block]

	Quarter Ended						Nine Months Ended
Reconciliation of Taxes from Federal Statutory	September 30,						September 30,
Rate to Total Income Tax Expense	2016			2015			2016			2015
Millions
Income Before Non-Controlling Interest and Income Taxes		$42.0			$74.7			$127.2			$149.7
Statutory Federal Income Tax Rate	35		%	35		%	35		%	35		%
Income Taxes Computed at 35 percent Statutory Federal Rate		$14.7			$26.1			$44.5			$52.4
Increase (Decrease) in Tax Due to:
State Income Taxes – Net of Federal Income Tax Benefit	0.9			(0.2		)	5.9			2.6
Production Tax Credits	(14.0		)	(11.0		)	(34.5		)	(31.8		)
Regulatory Differences for Utility Plant	—			(0.3		)	(0.1		)	(0.7		)
Other	0.1			(0.2		)	(0.1		)	4.5
Total Income Tax Expense		$1.7			$14.4			$15.7			$27.0