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Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2012
Statement of Other Comprehensive Income [Abstract] |
Other Comprehensive Income Disclosure | Other Comprehensive Income (Loss) The following table presents the tax effect allocated to each component of other comprehensive income (loss) for each period presented:
| Before-Tax |  | Income Tax |  | Net-of-Tax
| Amount |  | (Expense) Benefit |  | Amount
2012 |  |  |  |  |
Defined benefit pension plan and VEBAs: |  |  |  |  |
Net actuarial gain arising during the period | $ | 87.8 |  |  | $ | (33.5 | ) |  | $ | 54.3 |
Reclassification adjustments: |  |  |  |  |
Less: amortization of net actuarial loss | 3.1 |  |  | (1.1 | ) |  | 2.0 |
Less: amortization of prior service cost | 4.2 |  |  | (1.7 | ) |  | 2.5 |
Other comprehensive income (loss) relating to defined benefit pension plan and VEBAs | 95.1 |  |  | (36.3 | ) |  | 58.8 |
Unrealized gain on available for sale securities | 0.6 |  |  | (0.2 | ) |  | 0.4 |
Foreign currency translation adjustment | (0.2 | ) |  | — |  |  | (0.2 | )
Other comprehensive income | $ | 95.5 |  |  | $ | (36.5 | ) |  | $ | 59.0 |
2011 |  |  |  |  |
Defined benefit pension plan and VEBAs: |  |  |  |  |
Net actuarial loss arising during the period | $ | (110.6 | ) |  | $ | 42.2 |  |  | $ | (68.4 | )
Reclassification adjustments: |  |  |  |  |
Less: amortization of net actuarial gain | 0.6 |  |  | (0.2 | ) |  | 0.4 |
Less: amortization of prior service cost | 4.2 |  |  | (1.6 | ) |  | 2.6 |
Other comprehensive income (loss) relating to defined benefit pension plan and VEBAs | (105.8 | ) |  | 40.4 |  |  | (65.4 | )
Unrealized loss on available for sale securities | (0.1 | ) |  | — |  |  | (0.1 | )
Foreign currency translation adjustment | 0.2 |  |  | — |  |  | 0.2 |
Other comprehensive loss | $ | (105.7 | ) |  | $ | 40.4 |  |  | $ | (65.3 | )
2010 |  |  |  |  |
Defined benefit pension plan and VEBAs: |  |  |  |  |
Net actuarial gain arising during the period | $ | 25.5 |  |  | $ | (9.7 | ) |  | $ | 15.8 |
Reclassification adjustments |  |  |  |  |
Less: amortization of net actuarial gain | 0.7 |  |  | (0.2 | ) |  | 0.5 |
Less: amortization of prior service cost | 4.2 |  |  | (1.6 | ) |  | 2.6 |
Other comprehensive income (loss) relating to defined benefit pension plan and VEBAs | 30.4 |  |  | (11.5 | ) |  | 18.9 |
Unrealized gain on available for sale securities | 0.1 |  |  | — |  |  | 0.1 |
Foreign currency translation adjustment | (0.5 | ) |  | — |  |  | (0.5 | )
Other comprehensive income | $ | 30.0 |  |  | $ | (11.5 | ) |  | $ | 18.5 |

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