Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Reconciliation of Beginning and Ending Liability for Unrecognized Tax Benefits

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

($ in millions)	2015			2014
Balance at January 1	$	6.9		$	7.1
Additions for tax positions taken in the current year	0.6			0.6
Reduction for expiration of statute of limitations/audits	(1.6		)	(0.8		)
Balance at December 31	$	5.9		$	6.9

Schedule of Components of Income Before Income Taxes

The components of income before income taxes are:

($ in millions)	2015			2014		2013
U.S. operations	$	(4.0	)	$	57.5	$	28.9
International operations	120.1			111.5		118.2
Total income before income taxes	$	116.1		$	169.0	$	147.1

Schedule of Components of Income Tax Expense

The related provision for income taxes consists of:

($ in millions)	2015			2014			2013
Current:
Federal	$	1.0		$	5.2		$	—
State	0.9			0.5			0.3
International	33.3			34.5			38.2
Current income tax provision	35.2			40.2			38.5
Deferred:
Federal and state	(13.2		)	7.7			9.2
International	4.3			(0.7		)	(7.5		)
Deferred income tax provision	(8.9		)	7.0			1.7
Income tax expense	$	26.3		$	47.2		$	40.2

Schedule of Deferred Tax Assets and Liabilities

The significant components of our deferred tax assets and liabilities at December 31 are:

($ in millions)	2015			2014
Deferred tax assets
Net operating loss carryforwards	$	16.5		$	20.4
Tax credit carryforwards	40.8			40.4
Pension and deferred compensation	42.0			43.7
Other	19.3			20.0
Valuation allowance	(20.1		)	(22.1		)
Total deferred tax assets	98.5			102.4
Deferred tax liabilities:
Accelerated depreciation	35.0			36.8
Other	5.4			7.7
Total deferred tax liabilities	40.4			44.5
Net deferred tax asset	$	58.1		$	57.9

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the U.S. federal corporate tax rate to our effective consolidated tax rate on income before income taxes follows:

	2015		2014		2013
U.S. federal corporate tax rate	35.0	%	35.0	%	35.0	%
Tax on international operations less than U.S. tax rate	(5.1	)	(6.8	)	(5.3	)
Reversal of prior valuation allowance	—		(0.5	)	(1.0	)
Reversal of reserves for unrecognized tax benefits	(1.6	)	(0.5	)	(0.8	)
U.S. tax on international earnings, net of foreign tax credits	(4.6	)	(0.1	)	0.1
State income taxes, net of federal tax effect	0.3		1.5		0.1
U.S. research and development credits	(1.3	)	(0.9	)	(1.8	)
Other business credits and Section 199 Deduction	(1.3	)	(0.7	)	(0.5	)
Other	1.2		1.0		1.6
Effective tax rate	22.6	%	28.0	%	27.4	%