Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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)	2017			2016
Balance at January 1	$	6.2		$	5.9
Increase due to current year position	0.4			1.0
Increase due to prior year position	0.1			1.2
Reduction for expiration of statute of limitations/audits	(3.5		)	(0.9		)
Settlements	—			(1.0		)
Balance at December 31	$	3.2		$	6.2

Schedule of Components of Income Before Income Taxes

The components of income before income taxes are:

($ in millions)	2017		2016		2015
U.S. operations	$	96.5	$	84.5	$	(4.0	)
International operations	125.9		105.3		120.1
Total income before income taxes	$	222.4	$	189.8	$	116.1

Schedule of Components of Income Tax Expense

The related provision for income taxes consists of:

($ in millions)	2017			2016			2015
Current:
Federal	$	2.1		$	2.5		$	1.0
State	0.1			1.0			0.9
International	37.0			29.4			33.3
Current income tax provision	39.2			32.9			35.2
Deferred:
Federal and state	41.8			21.8			(13.2		)
International	(0.1		)	(0.3		)	4.3
Deferred income tax provision	41.7			21.5			(8.9		)
Income tax expense	$	80.9		$	54.4		$	26.3

Schedule of Deferred Tax Assets and Liabilities

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

($ in millions)	2017			2016
Deferred tax assets
Net operating loss carryforwards	$	19.7		$	15.4
Tax credit carryforwards	13.7			27.9
Restructuring and impairment charges	0.1			2.9
Pension and deferred compensation	28.3			46.4
Other	14.3			19.5
Valuation allowance	(20.9		)	(18.7		)
Total deferred tax assets	55.2			93.4
Deferred tax liabilities:
Accelerated depreciation	26.3			30.3
Tax on undistributed earnings of subsidiaries	9.8			—
Other	3.8			6.1
Total deferred tax liabilities	39.9			36.4
Net deferred tax asset	$	15.3		$	57.0

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:

	2017		2016		2015
U.S. federal corporate tax rate	35.0	%	35.0	%	35.0	%
Tax on international operations less than U.S. tax rate	(4.5	)	(2.9	)	(5.1	)
Reversal of prior valuation allowance	(0.5	)	(0.3	)	—
Reversal of reserves for unrecognized tax benefits	(0.2	)	(0.6	)	(1.6	)
U.S. tax on international earnings, net of foreign tax credits	0.1		(1.3	)	(4.6	)
State income taxes, net of federal tax effect	0.2		0.8		0.3
U.S. research and development credits	(0.8	)	(0.8	)	(1.3	)
Excess tax benefits on share-based payments	(14.1	)	—		—
Impact of 2017 Tax Act	15.9		—		—
Tax on undistributed earnings of subsidiaries	4.4		—		—
Venezuela deconsolidation	1.7		—		—
Other business credits and Section 199 Deduction	(0.6	)	(1.1	)	(1.3	)
Other	(0.2	)	(0.1	)	1.2
Effective tax rate	36.4	%	28.7	%	22.6	%