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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive (Loss) Income | The following table presents the changes in the accumulated balances for each component of Accumulated other comprehensive (loss) income ("AOCI") for each period presented (in millions of dollars):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Defined benefit pension plan and VEBAs: |  |  |  |  |  |
Beginning balance |  | $ | (31.3 | ) |  | $ | (96.4 | ) |  | $ | (20.8 | )
Actuarial loss arising during the period |  | (5.7 | ) |  | (12.9 | ) |  | (39.0 | )
Less: income tax benefit |  | 2.1 |  |  | 4.9 |  |  | 14.5 |
Net actuarial loss arising during the period |  | (3.6 | ) |  | (8.0 | ) |  | (24.5 | )
Prior service (cost) credit arising during the period |  | (8.3 | ) |  | 6.8 |  |  | (90.5 | )
Less: income tax benefit (expense) |  | 3.1 |  |  | (2.6 | ) |  | 33.8 |
Net prior service (cost) credit arising during the period |  | (5.2 | ) |  | 4.2 |  |  | (56.7 | )
Amortization of net actuarial loss (gain)1 |  | 0.5 |  |  | 1.1 |  |  | (1.8 | )
Amortization of prior service cost 1 |  | 4.1 |  |  | 3.0 |  |  | 10.6 |
Removal of obligation relating to Union VEBA |  | — |  |  | 106.6 |  |  | — |
Less: income tax expense 2 |  | (1.7 | ) |  | (41.8 | ) |  | (3.2 | )
Net amortization and reclassification from AOCI to Net income (loss) |  | 2.9 |  |  | 68.9 |  |  | 5.6 |
Translation impact on Canadian pension plan AOCI balance |  | 0.1 |  |  | — |  |  | — |
Other comprehensive (loss) income, net of tax |  | (5.8 | ) |  | 65.1 |  |  | (75.6 | )
Ending balance |  | $ | (37.1 | ) |  | $ | (31.3 | ) |  | $ | (96.4 | )
Available for sale securities: |  |  |  |  |  |
Beginning balance |  | $ | (0.1 | ) |  | $ | 0.2 |  |  | $ | 0.4 |
Unrealized gain (loss) on available for sale securities |  | 1.9 |  |  | (0.1 | ) |  | (0.2 | )
Less: income tax (expense) benefit |  | (0.7 | ) |  | — |  |  | 0.1 |
Net gain (loss) on available for sale securities |  | 1.2 |  |  | (0.1 | ) |  | (0.1 | )
Gain reclassified from AOCI to Net income (loss)3 |  | (0.5 | ) |  | (0.4 | ) |  | (0.1 | )
Less: income tax benefit 2 |  | 0.2 |  |  | 0.2 |  |  | — |
Net gain reclassified from AOCI to Net income (loss) |  | (0.3 | ) |  | (0.2 | ) |  | (0.1 | )
Other comprehensive income (loss), net of tax |  | 0.9 |  |  | (0.3 | ) |  | (0.2 | )
Ending balance |  | $ | 0.8 |  |  | $ | (0.1 | ) |  | $ | 0.2 |
Foreign currency cash flow hedges: |  |  |  |  |  |
Beginning balance |  | $ | (0.2 | ) |  | $ | — |  |  | $ | — |
Unrealized loss on foreign currency cash flow hedges |  | — |  |  | (0.3 | ) |  | — |
Less: income tax benefit |  | — |  |  | 0.1 |  |  | — |
Net loss on foreign currency cash flow hedges |  | — |  |  | (0.2 | ) |  | — |
Loss reclassified from AOCI to Net income (loss)4 |  | 0.1 |  |  | — |  |  | — |
Less: income tax (expense) benefit 2 |  | — |  |  | — |  |  | — |
Net loss reclassified from AOCI to Net income (loss) |  | 0.1 |  |  | — |  |  | — |
Other comprehensive income (loss), net of tax |  | 0.1 |  |  | (0.2 | ) |  | — |
Ending balance |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | — |
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Alloy Hedges: |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | — |  |  | $ | — |
Unrealized loss on Alloy Hedges |  | (0.1 | ) |  | — |  |  | — |
Less: income tax (expense) benefit |  | — |  |  | — |  |  | — |
Other comprehensive loss, net of tax |  | (0.1 | ) |  | — |  |  | — |
Ending balance |  | $ | (0.1 | ) |  | $ | — |  |  | $ | — |
Foreign currency translation: |  |  |  |  |  |
Beginning balance |  | $ | (0.1 | ) |  | $ | 0.1 |  |  | $ | (0.3 | )
(Loss) gain on foreign currency translation |  | (0.1 | ) |  | (0.2 | ) |  | 0.4 |
Less: income tax (expense) benefit |  | — |  |  | — |  |  | — |
Other comprehensive (loss) income, net of tax |  | (0.1 | ) |  | (0.2 | ) |  | 0.4 |
Ending balance |  | $ | (0.2 | ) |  | $ | (0.1 | ) |  | $ | 0.1 |
Total AOCI ending balance |  | $ | (36.7 | ) |  | $ | (31.7 | ) |  | $ | (96.1 | )
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1. | Amounts reclassified out of AOCI relating to VEBA adjustments were included as a component of Net periodic postretirement benefit cost (income) relating to VEBAs.
2. | Income tax amounts reclassified out of AOCI were included as a component of Income tax (provision) benefit.
3. | Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other (expense) income, net. We use the specific identification method to determine the amount reclassified out of AOCI.
4. | Amounts reclassified out of AOCI relating to foreign currency cash flow hedges were included as a component of Other (expense) income, net.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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