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Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined benefit pension plan and VEBAs, before tax |  |  |
Net actuarial (loss) gain arising during the period, before tax | $ 87.8 | $ (110.6) | $ 25.5
Reclassification adjustments: |  |  |
Less: amortization of net actuarial loss, before tax | 3.1 | 0.6 | 0.7
Less: amortization of prior service cost, before tax | 4.2 | 4.2 | 4.2
Other comprehensive income (loss) relating to defined benefit pension plan and VEBAs | 95.1 | (105.8) | 30.4
Unrealized gain (loss) on available for sale securities, before tax | 0.6 | (0.1) | 0.1
Foreign currency translation adjustment, before tax | (0.2) | 0.2 | (0.5)
Other comprehensive income (loss), before tax | 95.5 | (105.7) | 30.0
Defined benefit pension plan and VEBAs, Income tax (expense) benefit |  |  |
Net actuarial (gain) loss arising during the period, income tax (expense) benefit | (33.5) | 42.2 | (9.7)
Reclassification adjustments, Income tax expense: |  |  |
Less: amortization of net actuarial loss, income tax expense | (1.1) | (0.2) | (0.2)
Less: amortization of prior service cost, income tax expense | (1.7) | (1.6) | (1.6)
Total income recognized in Accumulated other comprehensive income related to defined benefit pension plan and VEBAs, Income tax expense | (36.3) | 40.4 | (11.5)
Unrealized gain on available for sale securities, Income tax expense | (0.2) | 0 | 0
Foreign currency translation adjustment, Income tax expense | 0 | 0 | 0
Income tax (expense) benefit related to items of other comprehensive income (loss) | (36.5) | 40.4 | (11.5)
Defined benefit pension plan and VEBAs, net of tax |  |  |
Net actuarial (loss) gain arising during the period, net-of-tax | 54.3 | (68.4) | 15.8
Reclassification Adjustments, Net of Tax: |  |  |
Less: amortization of net actuarial loss, net of tax | 2.0 | 0.4 | 0.5
Less: amortization of prior service cost, net of tax | 2.5 | 2.6 | 2.6
Total income recognized in Accumulated other comprehensive income related to defined benefit pension plan and VEBAs, net of tax | 58.8 | (65.4) | 18.9
Unrealized gain on available for sale securities, net of tax | 0.4 | (0.1) | 0.1
Foreign currency translation adjustment, net of tax | (0.2) | 0.2 | (0.5)
Other comprehensive income (loss), net of tax | $ 59.0 | $ (65.3) | $ 18.5

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