Pension and Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2016

General Discussion of Pension and Other Postretirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

For the three and six months ended June 30, 2016 and 2015, pension and postretirement benefit costs were as follows:

	Three Months Ended June 30,
	2016			2015			2016			2015
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	0.3		$	—		$	—
Interest cost on projected benefit obligation	4.8			4.9			0.9			0.9
Expected return on plan assets	(6.8		)	(7.3		)	—			—
Curtailment loss	—			0.3			—			—
Amortization of:
Prior service cost (benefit)	—			—			(3.7		)	(3.8		)
Actuarial loss	4.8			9.4			1.3			1.3
Total amortization	4.8			9.4			(2.4		)	(2.5		)
Pension / postretirement cost (benefit)	$	2.8		$	7.6		$	(1.5	)	$	(1.6	)

	Six Months Ended June 30,
	2016			2015			2016			2015
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	—		$	0.3		$	0.1		$	0.1
Interest cost on projected benefit obligation	9.6			9.5			1.7			1.7
Expected return on plan assets	(13.6		)	(14.5		)	—			—
Curtailment loss	—			0.3			—			—
Amortization of:
Prior service cost (benefit)	—			0.1			(7.4		)	(7.7		)
Actuarial loss	9.6			14.5			2.5			2.7
Total amortization	9.6			14.6			(4.9		)	(5.0		)
Pension / postretirement cost (benefit)	$	5.6		$	10.2		$	(3.1	)	$	(3.2	)