Pension and Postretirement Benefit Costs (Tables)

9 Months Ended

Sep. 30, 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						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
	(Dollars in millions)
Service cost for benefits earned	$	0.6		$	0.6		$	1.6		$	1.7
Interest cost on projected benefit obligation	11.3			10.6			34.0			31.7
Expected return on plan assets	(13.6		)	(14.9		)	(40.7		)	(44.6		)
Amortization of prior service cost and net actuarial loss	7.9			16.6			23.6			49.9
Net periodic pension cost	$	6.2		$	12.9		$	18.5		$	38.7

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					Nine Months Ended
	September 30,					September 30,
	2014		2013			2014		2013
	(Dollars in millions)
Service cost for benefits earned	$	3.1	$	4.0		$	9.2	$	11.8
Interest cost on accumulated postretirement benefit obligation	9.1		10.5			27.3		31.4
Amortization of prior service cost and net actuarial loss	3.9		5.6			11.8		16.8
Special termination benefits	—		(0.6		)	—		0.9
Net periodic postretirement benefit cost	$	16.1	$	19.5		$	48.3	$	60.9