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Components of accumulated other comprehensive loss (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated balances for each component of AOCI
 
June 30, 2018
 
December 31, 2017
Defined benefit plan liabilities
$
(98.2
)
 
$
(102.1
)
Unrealized loss on financial instruments
2.6

 
2.7

Other comprehensive loss before income tax effect
(95.6
)
 
(99.4
)
Income tax effect (1)
6.9

 
7.7

Accumulated other comprehensive loss
$
(88.7
)
 
$
(91.7
)

(1) The allocation of the income tax effect to the components of other comprehensive loss is as follows:
 
June 30, 2018
 
December 31, 2017
Defined benefit plan liabilities
$
7.4

 
$
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 accumulated other comprehensive loss ("AOCL"):
 
Defined benefit plan and other postretirement liabilities
 
Unrealized gain (loss) on financial instruments
 
Total, net of tax
Balance, April 1, 2018
$
(93.4
)
 
$
2.1

 
$
(91.3
)
Net amount reclassified to net loss
2.6

 
0.0

 
2.6

Balance, June 30, 2018
$
(90.8
)
 
$
2.1

 
$
(88.7
)
 
 
 
 
 
 
Balance, April 1, 2017
$
(115.5
)
 
$
2.3

 
$
(113.2
)
Net amount reclassified to net loss
0.2

 
0.0

 
0.2

Balance, June 30, 2017
$
(115.2
)
 
$
2.2

 
$
(113.0
)
 
 
 
 
 
 
Balance, January 1, 2018
$
(93.8
)
 
$
2.1

 
$
(91.7
)
Net amount reclassified to net loss
3.1

 
(0.1
)
 
3.0

Balance, June 30, 2018
$
(90.8
)
 
$
2.1

 
$
(88.7
)
 
 
 
 
 
 
Balance, January 1, 2017
$
(116.2
)
 
$
2.3

 
$
(113.9
)
Net amount reclassified to net loss
1.0

 
(0.1
)
 
0.9

Balance, June 30, 2017
$
(115.2
)
 
$
2.2

 
$
(113.0
)
Reclassification out of AOCI
Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
 
 
 
 
For the three months ended June 30,
 
For the six months ended June 30,
AOCL Components
 
Location
 
2018
 
2017
 
2018
 
2017
Defined benefit plan and other postretirement liabilities
 
Cost of goods sold
 
$
2.7

 
$
(1.5
)
 
$
3.5

 
$
(0.2
)
 
 
Selling, general and administrative expenses
 
(0.1
)
 
0.8

 
(0.5
)
 
1.0

 
 
Other operating expense, net
 
0.4

 
0.6

 
0.9

 
0.9

 
 
Income tax effect
 
(0.4
)
 
0.3

 
(0.8
)
 
(0.7
)
 
 
Net of tax
 
$
2.6

 
$
0.2

 
$
3.1

 
$
1.0

 
 
 
 
 
 
 
 
 
 
 
Unrealized loss on financial instruments
 
Cost of goods sold
 
$
0.0

 
$
0.0

 
$
(0.1
)
 
$
(0.1
)
 
 
Income tax effect
 
0.0

 
0.0

 
0.0

 
0.0

 
 
Net of tax
 
$
0.0

 
$
0.0

 
$
(0.1
)
 
$
(0.1
)