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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2011
Other Comprehensive Income [Abstract]  
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