Retirement Benefits Plans (Tables)

9 Months Ended

Sep. 30, 2014

Defined benefit plan expense consisted of the following components:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(Dollars in millions)
Interest cost on benefit obligations	$	0.3		$	0.3		$	1.1		$	1.0
Expected return on plan assets	(0.4		)	(0.6		)	(1.3		)	(1.8		)
Amortization of actuarial losses	0.2			0.3			0.4			0.8
Total expense	$	0.1		$	—		$	0.2		$	—

Postretirement benefit plans benefit consisted of the following components:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(Dollars in millions)
Service cost	$	0.2		$	0.1		$	0.2		$	0.2
Interest cost on benefit obligations	0.3			0.3			1.1			1.0
Amortization of:
Actuarial losses	0.2			0.4			0.7			1.1
Prior service benefit	(1.4		)	(1.4		)	(4.2		)	(4.3		)
Total benefit	$	(0.7	)	$	(0.6	)	$	(2.2	)	$	(2.0	)