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Accumulated Other Comprehensive Loss (AOCL) (Tables)
 12 Months Ended
Dec. 31, 2018
Additional financial information disclosures [Abstract]  
Components of Accumulated Other Comprehensive Loss
Components of AOCL
2018
 
2017
Defined benefit plan liabilities
$
(107.3
)
 
$
(102.1
)
Unrealized gain (loss) on financial instruments
2.5

 
2.7

Other comprehensive loss before income tax effect
(104.8
)
 
(99.4
)
Income tax effect(1)
6.1

 
7.7

Accumulated other comprehensive loss
$
(98.7
)
 
$
(91.7
)


(1) 
The allocation of the income tax effect to the components of other comprehensive loss is as follows:
 
2018
 
2017
Defined benefit plan liabilities
$
6.6

 
$
8.2

Unrealized loss on financial instruments
(0.5
)
 
(0.5
)


The following table summarizes the changes in the accumulated balances for each component of AOCL:
 
Defined benefit plan and other postretirement liabilities
 
Unrealized gain (loss) on financial instruments
 
Total, net of tax
Balance, December 31, 2015
$
(110.7
)
 
$
(2.0
)
 
$
(112.7
)
Other comprehensive (loss) before reclassifications
(9.5
)
 
—

 
(9.5
)
Net amount reclassified to net income (loss)
4.0

 
4.3

 
8.3

Balance, December 31, 2016
(116.2
)
 
2.3

 
(113.9
)
Other comprehensive income before reclassifications
20.3

 
—

 
20.3

Net amount reclassified to net income (loss)
2.1

 
(0.2
)
 
1.9

Balance, December 31, 2017
(93.8
)
 
2.1

 
(91.7
)
Other comprehensive (loss) before reclassifications
(7.3
)
 
—

 
(7.3
)
Net amount reclassified to net income (loss)
0.4

 
(0.1)
 
0.3

Balance, December 31, 2018
$
(100.7
)
 
$
2.0

 
$
(98.7
)
Reclassification out of AOCI
Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
AOCL Components
 
Location
 
2018
 
2017
 
2016
Defined benefit plan and other postretirement liabilities
 
Cost of goods sold
 
$
2.8

 
$
3.1

 
$
3.5

 
 
Selling, general and administrative expenses
 
(1.9
)
 
(0.4
)
 
0.5

 
 
Other operating expense, net
 
1.2

 
1.0

 
1.6

 
 
Income tax expense
 
(1.6
)
 
(1.6
)
 
(1.5
)
 
 
Net of tax
 
$
0.5

 
$
2.1

 
$
4.1

 
 
 
 
 
 
 
 
 
Gain (loss) on financial instruments
 
Cost of goods sold
 
$
(0.2
)
 
$
(0.2
)
 
$
(0.2
)
 
 
Helguvik impairment
 
—

 
—

 
4.5

 
 
Income tax benefit
 
0.0

 
0.0

 
(0.0
)
 
 
Net of tax
 
$
(0.2
)
 
$
(0.2
)
 
$
4.3