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Income Taxes (Tables) | 12 Months Ended
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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 | %

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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