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Components of accumulated other comprehensive loss (Tables) | 6 Months Ended
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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 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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