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Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]  
Schedule of Other Comprehensive (Loss) Income
The following table presents the tax effect allocated to each component of other comprehensive income (loss) for each period presented (in millions of dollars):
 
 
 
Income Tax
 
 
 
Before-Tax
 
(Expense)
 
Net-of-Tax
 
Amount
 
Benefit1
 
Amount
2015
 
 
 
 
 
Defined benefit pension plan and VEBAs:
 
 
 
 
 
Net actuarial loss arising during the period
$
(12.9
)
 
$
4.9

 
$
(8.0
)
Prior service credit arising during the period
6.8

 
(2.6
)
 
4.2

Total actuarial loss and prior service costs
(6.1
)
 
2.3

 
(3.8
)
Reclassification adjustments:
 
 
 
 
 
Amortization of net actuarial loss2
1.1

 
(0.4
)
 
0.7

Amortization of prior service cost2
3.0

 
(1.2
)
 
1.8

Removal of obligation relating to Union VEBA
106.6

 
(40.2
)
 
66.4

Other comprehensive income relating to defined benefit pension plan and VEBAs
104.6

 
(39.5
)
 
65.1

Available for sale securities:
 
 
 
 
 
Unrealized loss on available for sale securities
(0.1
)
 
—

 
(0.1
)
Reclassification adjustments:
 
 
 
 
 
Reclassification of unrealized gain upon sale of available for sale securities3
(0.4
)
 
0.2

 
(0.2
)
Other comprehensive loss relating to available for sale securities
(0.5
)
 
0.2

 
(0.3
)
Unrealized loss on foreign currency cash flow hedges
(0.3
)
 
0.1

 
(0.2
)
Foreign currency translation loss
(0.2
)
 
—

 
(0.2
)
Other comprehensive income
$
103.6

 
$
(39.2
)
 
$
64.4

 
 
 
 
 
 
2014
 
 
 
 
 
Defined benefit pension plan and VEBAs:
 
 
 
 
 
Net actuarial loss arising during the period
$
(39.0
)
 
$
14.5

 
$
(24.5
)
Prior service cost arising during the period
(90.5
)
 
33.8

 
(56.7
)
Total actuarial loss and prior service costs
(129.5
)
 
48.3

 
(81.2
)
Reclassification adjustments:
 
 
 
 
 
Amortization of net actuarial (gain)2
(1.8
)
 
0.7

 
(1.1
)
Amortization of prior service cost2
10.6

 
(3.9
)
 
6.7

Other comprehensive loss relating to defined benefit pension plan and VEBAs
(120.7
)
 
45.1

 
(75.6
)
Available for sale securities:
 
 
 
 
 
Unrealized loss on available for sale securities
(0.2
)
 
0.1

 
(0.1
)
Reclassification adjustments:
 
 
 
 
 
Reclassification of unrealized gain upon sale of available for sale securities3
(0.1
)
 
—

 
(0.1
)
Other comprehensive loss relating to available for sale securities
(0.3
)
 
0.1

 
(0.2
)
Foreign currency translation gain
0.4

 
—

 
0.4

Other comprehensive loss
$
(120.6
)
 
$
45.2

 
$
(75.4
)
 
 
 
 
 
 
 
 
 
Income Tax
 
 
 
Before-Tax
 
(Expense)
 
Net-of-Tax
 
Amount
 
Benefit1
 
Amount
2013
 
 
 
 
 
Defined benefit pension plan and VEBAs:
 
 
 
 
 
Net actuarial gain arising during the period
$
87.0

 
$
(32.5
)
 
$
54.5

Prior service cost arising during the period
(84.8
)
 
31.8

 
(53.0
)
Total actuarial gain and prior service costs
2.2

 
(0.7
)
 
1.5

Reclassification adjustments:
 
 
 
 
 
Amortization of net actuarial loss2
1.5

 
(0.5
)
 
1.0

Amortization of prior service cost2
4.2

 
(1.6
)
 
2.6

Other comprehensive income relating to defined benefit pension plan and VEBAs
7.9

 
(2.8
)
 
5.1

Available for sale securities:
 
 
 
 
 
Unrealized gain on available for sale securities
1.0

 
(0.3
)
 
0.7

Reclassification adjustments:
 
 
 
 
 
Reclassification of unrealized gain upon sale of available for sale securities3
(1.0
)
 
0.3

 
(0.7
)
Other comprehensive income relating to available for sale securities
—

 
—

 
—

Foreign currency translation gain
0.2

 
—

 
0.2

Other comprehensive income
$
8.1

 
$
(2.8
)
 
$
5.3


____________
1. 
Income tax amounts reclassified out of Accumulated other comprehensive loss relating to VEBA adjustments and sales of available for sale securities were included as a component of Income tax benefit (provision).
2. 
Amounts reclassified out of Accumulated other comprehensive loss relating to VEBA adjustments were included as a component of Net periodic postretirement benefit cost (income) relating to VEBAs.
3. 
Amounts reclassified out of Accumulated other comprehensive loss relating to sales of available for sale securities were included as a component of Other (expense) income, net. We use the specific identification method to determine the amount reclassified out of Accumulated other comprehensive loss.