Income Taxes (Tables)

12 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Schedule of income before income taxes for the Company's domestic and foreign operations

Income before income taxes for the Company’s domestic and foreign operations was as follows:

	Years Ended June 30,
($ in millions)	2016		2015		2014
Domestic	$	17.3	$	64.3	$	178.6
Foreign	4.2		24.8		17.8
Income before income taxes	$	21.5	$	89.1	$	196.4

Schedule of provision (benefit) for income taxes from continuing operations

The provision (benefit) for income taxes from continuing operations consisted of the following:

	Years Ended June 30,
($ in millions)	2016		2015			2014
Current:
Federal	$	4.7	$	(39.3	)	$	61.3
State	0.4		1.2			6.5
Foreign	4.3		8.1			5.5
Total current	9.4		(30.0		)	73.3
Deferred:
Federal	0.1		60.2			(8.0		)
State	0.5		0.1			(1.4		)
Foreign	0.2		0.1			(0.3		)
Total deferred	0.8		60.4			(9.7		)
Total income tax expense	$	10.2	$	30.4		$	63.6

Schedule of reconciliation of income taxes computed at the U.S. Federal income tax rate to the Company's effective income tax rate

The following is a reconciliation of income taxes computed at the U.S. Federal income tax rate to the Company’s effective income tax rates:

	Years Ended June 30,
(% of pre-tax income)	2016		2015		2014
Statutory federal income tax rate	35.0	%	35.0	%	35.0	%
State income taxes, net of federal tax benefit	2.2		2.2		2.5
Foreign tax rate differential	5.5		(1.6	)	(0.3	)
Domestic manufacturing deduction	(7.0	)	(2.7	)	(3.5	)
Law changes	(3.8	)	1.8		0.1
Increases (decreases) in valuation allowances	2.1		(0.3	)	(0.8	)
Unremitted earnings of foreign subsidiary	12.7		—		—
Non-deductible goodwill impairment	5.1		—		—
Research and development tax credit	(8.4	)	(0.9	)	(0.3	)
Other, net	4.0		0.6		(0.3	)
Effective income tax rate	47.4	%	34.1	%	32.4	%

Summary of components of deferred tax assets and liabilities

	June 30,
($ in millions)	2016			2015
Deferred tax assets:
Pensions	$	193.5		$	125.1
Postretirement provisions	51.0			48.9
Net operating loss carryforwards	20.5			20.3
Derivatives and hedging activities	14.8			18.5
Other	37.4			32.6
Gross deferred tax assets	317.2			245.4
Valuation allowances	(17.7		)	(17.5		)
Total deferred tax assets	299.5			227.9
Deferred tax liabilities:
Depreciation	(333.0		)	(321.2		)
Intangible assets	(20.4		)	(26.1		)
Inventories	(27.4		)	(17.6		)
Other	(12.9		)	(6.2		)
Total deferred tax liabilities	(393.7		)	(371.1		)
Deferred tax liabilities	$	(94.2	)	$	(143.2	)

Schedule of reconciliation of the beginning and ending amount of gross unrecognized tax benefits for uncertain tax positions

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for uncertain tax positions is as follows:

	Years Ended June 30,
($ in millions)	2016		2015		2014
Balance, beginning	$	—	$	—	$	1.4
Reductions as a result of a lapse of statute of limitations	—		—		(1.1		)
Reductions based on tax positions of prior year	—		—		(0.1		)
Reductions as a result of settlements with taxing authorities	—		—		(0.2		)
Balance, ending	$	—	$	—	$	—