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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (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.