Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended June 30, 2013 and 2012 were as follows (in millions):

	Retirement Plans						PBOP
	For the Three Months Ended June 30,						For the Three Months Ended June 30,
	2013			2012			2013			2012
Service cost	$	1.1		$	1.0		$	0.1		$	0.1
Interest cost	1.2			1.5			0.4			0.6
Expected return on plan assets	(2.3		)	(2.2		)	(1.1		)	(1.0		)
Amortization of prior service credit	—			—			(1.9		)	(2.0		)
Amortization of unrecognized net loss	0.6			0.5			(0.1		)	—
Net periodic benefit cost	$	0.6		$	0.8		$	(2.6	)	$	(2.3	)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the six months ended June 30, 2013 and 2012 were as follows (in millions):

	Retirement Plans						PBOP
	For the Six Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Service cost	$	2.2		$	2.0		$	0.2		$	0.2
Interest cost	2.4			2.9			0.9			1.2
Expected return on plan assets	(4.5		)	(4.3		)	(2.2		)	(2.1		)
Amortization of prior service credit	—			—			(3.8		)	(3.9		)
Amortization of unrecognized net loss	1.2			1.0			—			0.1
Net periodic benefit cost	$	1.3		$	1.6		$	(4.9	)	$	(4.5	)