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Accumulated Other Comprehensive (Loss) Income | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Accumulated Other Comprehensive (Loss) Income | 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 | )
____________
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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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