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Accumulated Other Comprehensive (Loss) Income | 9 Months Ended
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Sep. 30, 2017
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):
|  | Quarter Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Salaried VEBA and defined benefit pension plan: |  |  |  |  |  |  |  |
Beginning balance |  | $ | (35.4 | ) |  | $ | (29.8 | ) |  | $ | (37.1 | ) |  | $ | (31.3 | )
Amortization of net actuarial loss 1 |  | 0.2 |  |  | 0.1 |  |  | 0.6 |  |  | 0.3 |
Amortization of prior service cost 1 |  | 1.2 |  |  | 1.0 |  |  | 3.6 |  |  | 3.0 |
Less: income tax expense 2 |  | (0.5 | ) |  | (0.4 | ) |  | (1.6 | ) |  | (1.2 | )
Net amortization reclassified from AOCI to Net income |  | 0.9 |  |  | 0.7 |  |  | 2.6 |  |  | 2.1 |
Translation impact on Canadian pension plan AOCI balance |  | (0.1 | ) |  | — |  |  | (0.1 | ) |  | 0.1 |
Other comprehensive income, net of tax |  | 0.8 |  |  | 0.7 |  |  | 2.5 |  |  | 2.2 |
Ending balance |  | $ | (34.6 | ) |  | $ | (29.1 | ) |  | $ | (34.6 | ) |  | $ | (29.1 | )
Available for sale securities: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 1.1 |  |  | $ | 0.2 |  |  | $ | 0.8 |  |  | $ | (0.1 | )
Unrealized gain on available for sale securities |  | 1.0 |  |  | 0.9 |  |  | 3.1 |  |  | 1.3 |
Less: income tax expense |  | (0.4 | ) |  | (0.4 | ) |  | (1.2 | ) |  | (0.5 | )
Net unrealized gain on available for sale securities |  | 0.6 |  |  | 0.5 |  |  | 1.9 |  |  | 0.8 |
Reclassification of unrealized gain upon sale of available for sale securities 3 |  | (0.5 | ) |  | (0.3 | ) |  | (2.1 | ) |  | (0.3 | )
Less: income tax benefit 2 |  | 0.2 |  |  | 0.1 |  |  | 0.8 |  |  | 0.1 |
Net unrealized gain reclassified from AOCI to Net income |  | (0.3 | ) |  | (0.2 | ) |  | (1.3 | ) |  | (0.2 | )
Other comprehensive income, net of tax |  | 0.3 |  |  | 0.3 |  |  | 0.6 |  |  | 0.6 |
Ending balance |  | $ | 1.4 |  |  | $ | 0.5 |  |  | $ | 1.4 |  |  | $ | 0.5 |
Other: |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | (0.3 | ) |  | $ | (0.4 | ) |  | $ | (0.3 | )
Unrealized gain |  | 1.1 |  |  | 0.1 |  |  | 1.4 |  |  | 0.2 |
Less: income tax expense |  | (0.4 | ) |  | — |  |  | (0.5 | ) |  | (0.1 | )
Net gain |  | 0.7 |  |  | 0.1 |  |  | 0.9 |  |  | 0.1 |
Gain reclassified from AOCI to Net income |  | (0.3 | ) |  | — |  |  | — |  |  | — |
Less: income tax benefit 2 |  | 0.1 |  |  | — |  |  | — |  |  | — |
Net gain reclassified from AOCI to Net income |  | (0.2 | ) |  | — |  |  | — |  |  | — |
Other comprehensive income, net of tax |  | 0.5 |  |  | 0.1 |  |  | 0.9 |  |  | 0.1 |
Ending balance |  | $ | 0.5 |  |  | $ | (0.2 | ) |  | $ | 0.5 |  |  | $ | (0.2 | )
Total AOCI ending balance |  | $ | (32.7 | ) |  | $ | (28.8 | ) |  | $ | (32.7 | ) |  | $ | (28.8 | )
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1 | Amounts reclassified out of AOCI relating to Salaried VEBA adjustments were included as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.
2 | Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
3 | Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.

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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 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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- References No definition available. + Details
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