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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2012
Statement of Income and Comprehensive Income [Abstract]  
Other Comprehensive Income
The following table presents the tax effect allocated to each component of Other comprehensive income for each period presented:
 
Before-Tax
 
Income Tax
 
Net-of-Tax
 
Amount
 
Expense
 
Amount
Quarter ended March 31, 2012
 
 
 
 
 
Defined benefit pension plan and VEBAs:
 
 
 
 
 
Reclassification adjustments:
 
 
 
 
 
  Less: amortization of net actuarial loss
$
0.8

 
$
(0.3
)
 
$
0.5

  Less: amortization of prior service cost
1.0

 
(0.4
)
 
0.6

Total income recognized in Accumulated other comprehensive loss related to defined benefit pension plan and VEBAs
1.8

 
(0.7
)
 
1.1

Unrealized gain on available for sale securities
0.3

 
—

 
0.3

Foreign currency translation adjustment
(0.3
)
 
—

 
(0.3
)
Other comprehensive income
$
1.8

 
$
(0.7
)
 
$
1.1

 
 
 
 
 
 
Quarter ended March 31, 2011
 
 
 
 
 
Defined benefit pension plan and VEBAs:
 
 
 
 
 
Reclassification adjustments:
 
 
 
 
 
  Less: amortization of net actuarial loss
$
0.1

 
$
—

 
$
0.1

  Less: amortization of prior service cost
1.0

 
(0.4
)
 
0.6

Total income recognized in Accumulated other comprehensive income related to defined benefit pension plans
1.1

 
(0.4
)
 
0.7

Foreign currency translation adjustment
(0.3
)
 
—

 
(0.3
)
Other comprehensive income
$
0.8

 
$
(0.4
)
 
$
0.4