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Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2011
Other Comprehensive Income [Abstract] |
Other Comprehensive (Loss) Income Disclosure | Other Comprehensive (Loss) Income The following table presents the tax effect allocated to each component of other comprehensive (loss) income for each period presented:
| Before-Tax |  | Income Tax |  | Net-of-Tax
| Amount |  | (Expense) Benefit |  | Amount
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 |
Total loss recognized in Accumulated other comprehensive loss related 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 |
Total income recognized in Accumulated other comprehensive income related to defined benefit pension plans | 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 |
2009 |  |  |  |  |
Defined benefit pension plan and VEBAs: |  |  |  |  |
Net actuarial gain arising during the period | $ | 66.3 |  |  | $ | (25.0 | ) |  | $ | 41.3 |
Prior service cost arising during the period | (33.8 | ) |  | 12.7 |  |  | (21.1 | )
Reclassification adjustments |  |  |  |  |
Less: amortization of net actuarial loss | 3.8 |  |  | (1.4 | ) |  | 2.4 |
Less: amortization of prior service cost | 1.6 |  |  | (0.6 | ) |  | 1.0 |
Total income recognized in Accumulated other comprehensive income related to defined benefit pension plans | 37.9 |  |  | (14.3 | ) |  | 23.6 |
Foreign currency translation adjustment | (1.5 | ) |  | — |  |  | (1.5 | )
Other comprehensive income | $ | 36.4 |  |  | $ | (14.3 | ) |  | $ | 22.1 |

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- Definition Other Comprehensive Income (Loss) Disclosure [Text Block] + References No definition available. + Details
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