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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The following table presents the changes in the components of accumulated other comprehensive loss, net of tax:
($ in millions) | Losses on cash flow hedges |  | Unrealized gains on investment securities |  | Defined benefit pension and other postretirement plans |  | Foreign currency translation |  | Total
Balance, December 31, 2015 | $ | (3.1 | ) |  | $ | 5.4 |  |  | $ | (39.6 | ) |  | $ | (125.3 | ) |  | $ | (162.6 | )
Other comprehensive loss before reclassifications | (1.2 | ) |  | (0.2 | ) |  | (9.2 | ) |  | (18.1 | ) |  | (28.7 | )
Amounts reclassified out | 1.1 |  |  | — |  |  | 3.4 |  |  | — |  |  | 4.5 |
Other comprehensive loss, net of tax | (0.1 | ) |  | (0.2 | ) |  | (5.8 | ) |  | (18.1 | ) |  | (24.2 | )
Balance, December 31, 2016 | (3.2 | ) |  | 5.2 |  |  | (45.4 | ) |  | (143.4 | ) |  | (186.8 | )
Other comprehensive (loss) income before reclassifications | (3.6 | ) |  | (4.7 | ) |  | 6.3 |  |  | 68.8 |  |  | 66.8 |
Amounts reclassified out | 2.6 |  |  | — |  |  | 0.1 |  |  | — |  |  | 2.7 |
Other comprehensive (loss) income, net of tax | (1.0 | ) |  | (4.7 | ) |  | 6.4 |  |  | 68.8 |  |  | 69.5 |
Balance, December 31, 2017 | $ | (4.2 | ) |  | $ | 0.5 |  |  | $ | (39.0 | ) |  | $ | (74.6 | ) |  | $ | (117.3 | )
Reclassification out of Accumulated Other Comprehensive Loss | A summary of the reclassifications out of accumulated other comprehensive loss is presented in the following table ($ in millions):
Detail of components |  | 2017 |  | 2016 |  | Location on Statement of Income
Losses on cash flow hedges: |  |  |  |  |  |
Foreign currency contracts |  | $ | (1.3 | ) |  | $ | — |  |  | Net sales
Foreign currency contracts |  | (1.2 | ) |  | — |  |  | Cost of goods and services sold
Interest rate swap contracts |  | (0.7 | ) |  | (1.3 | ) |  | Interest expense
Forward treasury locks |  | (0.4 | ) |  | (0.4 | ) |  | Interest expense
Total before tax |  | (3.6 | ) |  | (1.7 | ) |  |
Tax expense |  | 1.0 |  |  | 0.6 |  |  |
Net of tax |  | $ | (2.6 | ) |  | $ | (1.1 | ) |  |
Amortization of defined benefit pension and other postretirement plans: |  |  |  |  |  |
Transition obligation |  | $ | — |  |  | $ | (0.1 | ) |  | (a)
Prior service credit |  | 2.1 |  |  | 1.4 |  |  | (a)
Actuarial losses |  | (2.3 | ) |  | (3.4 | ) |  | (a)
Curtailment |  | — |  |  | (3.1 | ) |  | (a)
Total before tax |  | (0.2 | ) |  | (5.2 | ) |  |
Tax expense |  | 0.1 |  |  | 1.8 |  |  |
Net of tax |  | $ | (0.1 | ) |  | $ | (3.4 | ) |  |
Total reclassifications for the period, net of tax |  | $ | (2.7 | ) |  | $ | (4.5 | ) |  |
(a) These components are included in the computation of net periodic benefit cost. Please refer to Note 13, Benefit Plans, for additional details.

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