Pension and Postretirement Benefit Costs (Tables)

3 Months Ended

Mar. 31, 2014

Pension Plan, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic pension cost included the following components:

	Three Months Ended March 31,
	2014			2013
	(Dollars in millions)
Service cost for benefits earned	$	0.5		$	0.6
Interest cost on projected benefit obligation	11.3			10.6
Expected return on plan assets	(13.5		)	(14.9		)
Amortization of prior service cost	0.3			0.2
Amortization of actuarial loss	7.6			16.4
Net periodic pension cost	$	6.2		$	12.9

Other Postretirement Benefit Plan, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic postretirement benefit cost included the following components:

	Three Months Ended March 31,
	2014		2013
	(Dollars in millions)
Service cost for benefits earned	$	3.1	$	3.9
Interest cost on accumulated postretirement benefit obligation	9.1		10.5
Amortization of prior service cost (credit)	0.3		(0.4		)
Amortization of actuarial loss	3.6		6.0
Net periodic postretirement benefit cost	$	16.1	$	20.0