Employee Retirement Benefit Plans (Tables)

3 Months Ended

Sep. 30, 2017

Defined Benefit Plan [Abstract]

Components of Company's Net Periodic Benefit Costs

Components of the Company’s net periodic benefit costs are as follows:

	Three Months Ended    September 30,
(Dollars in millions)	2017			2016
Components of net periodic benefit cost:
Service cost	$	0.9		$	0.8
Interest cost	1.8			1.7
Expected return on plan assets	(2.9		)	(2.8		)
Amortization (1)	0.6			1.1
Net amount recognized	$	0.4		$	0.8

(1) Amount represents the amortization of unrecognized actuarial gains/(losses).