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Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
The following table presents the changes in the accumulated balances for each component of AOCI for each period presented (in millions of dollars):
 
 
Quarter Ended
 
 
March 31,
 
 
2019
 
2018
Defined Benefit Pension Plan and Salaried VEBA:
 
 
 
 
Beginning balance
 
$
(35.6
)
 
$
(38.5
)
Amortization of net actuarial loss1
 
0.1

 
0.2

Amortization of prior service cost1
 
1.4

 
1.3

Less: income tax expense2
 
(0.4
)
 
(0.3
)
Net amortization reclassified from AOCI to Net income
 
1.1

 
1.2

Other comprehensive income, net of tax
 
1.1

 
1.2

Ending balance
 
$
(34.5
)
 
$
(37.3
)
 
 
 
 
 
Available for Sale Securities:
 
 
 
 
Beginning balance
 
$
0.3

 
$
0.9

Unrealized gain on available for sale securities
 
1.0

 
1.0

Less: income tax expense
 
(0.3
)
 
(0.2
)
Net unrealized gain on available for sale securities
 
0.7

 
0.8

Reclassification of unrealized gain upon sale of available for sale securities3
 
(1.2
)
 
(1.5
)
Less: income tax benefit2
 
0.3

 
0.5

Net gain reclassified from AOCI to Net income
 
(0.9
)
 
(1.0
)
Other comprehensive loss, net of tax
 
(0.2
)
 
(0.2
)
Ending balance
 
$
0.1

 
$
0.7

 
 
 
 
 
Cash Flow Hedges:
 
 
 
 
Beginning balance
 
$
(13.4
)
 
$
0.5

Unrealized gain (loss) on cash flow hedges
 
7.4

 
(12.2
)
Less: income tax (expense) benefit
 
(1.8
)
 
3.0

Net unrealized gain (loss) on cash flow hedges
 
5.6

 
(9.2
)
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges4
 
4.2

 
(0.1
)
Less: income tax expense2
 
(1.0
)
 
—

Net loss (gain) reclassified from AOCI to Net income
 
3.2

 
(0.1
)
Other comprehensive income (loss), net of tax
 
8.8

 
(9.3
)
Ending balance
 
$
(4.6
)
 
$
(8.8
)
 
 
 
 
 
Foreign Currency Translation:
 
 
 
 
Beginning balance
 
$
(0.1
)
 
$
—

Other comprehensive income, net of tax
 
—

 
—

Ending balance
 
$
(0.1
)
 
$
—

 
 
 
 
 
Total AOCI ending balance
 
$
(39.1
)
 
$
(45.4
)
____________________
1 
Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other income, net, as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.
2 
Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
3 
Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income, net. We use the specific identification method to determine the amount reclassified out of AOCI.
4 
Amounts reclassified out of AOCI relating to cash flow hedges were included as a component of COGS. As of March 31, 2019, we estimate a net mark-to-market loss before tax of $7.4 million in AOCI will be reclassified into Net income within the next 12 months.