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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) |
|  | 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 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=84228862&loc=SL7669686-108580 + Details
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