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Accumulated Other Comprehensive Loss (AOCL) - Changes In Components Of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | $ 675.0 |  |  |  | $ 762.2 | $ 675.0 | $ 762.2 | $ 829.6
Other comprehensive (loss) before reclassifications |  |  |  |  |  |  |  |  | (13.5) | (12.7) | (7.3)
Net amount reclassified to net income (loss) |  |  |  |  |  |  |  |  | 4.5 | 2.9 | 0.3
Impact of ASU 2018-02 |  |  |  |  |  |  |  | (1.3) |  | (1.3) |
Balance, end | $ 546.1 |  |  |  | $ 675.0 |  |  |  | 546.1 | 675.0 | 762.2
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  | 1,641.6 | 1,860.5 | 1,916.1
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 43.5 | 47.4 | 40.2
Other operating expense, net |  |  |  |  |  |  |  |  | (0.5) | (0.8) | (0.4)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 3.1 | 8.4 | 0.2
Net income (loss) | (35.5) | $ (58.2) | $ (26.9) | (2.7) | (4.8) | $ (20.7) | $ (20.7) | (34.6) | (123.3) | (80.8) | (66.2)
Defined benefit plan and other postretirement liabilities |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | (111.7) |  |  |  | (100.7) | (111.7) | (100.7) | (93.8)
Other comprehensive (loss) before reclassifications |  |  |  |  |  |  |  |  | (13.5) | (12.7) | (7.3)
Net amount reclassified to net income (loss) |  |  |  |  |  |  |  |  | 4.6 | 3.0 | 0.4
Impact of ASU 2018-02 |  |  |  |  |  |  |  |  |  | (1.3) |
Balance, end | (120.6) |  |  |  | (111.7) |  |  |  | (120.6) | (111.7) | (100.7)
Unrealized gain (loss) on financial instruments |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | 1.9 |  |  |  | 2.0 | 1.9 | 2.0 | 2.1
Other comprehensive (loss) before reclassifications |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net amount reclassified to net income (loss) |  |  |  |  |  |  |  |  | (0.1) | (0.1) | (0.1)
Impact of ASU 2018-02 |  |  |  |  |  |  |  |  |  | 0.0 |
Balance, end | 1.8 |  |  |  | 1.9 |  |  |  | 1.8 | 1.9 | 2.0
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, start |  |  |  | $ (109.8) |  |  |  | $ (98.7) | (109.8) | (98.7) | (91.7)
Balance, end | $ (118.8) |  |  |  | $ (109.8) |  |  |  | (118.8) | (109.8) | (98.7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan and other postretirement liabilities |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  | (4.7) | (3.2) | 2.8
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | (2.0) | (4.4) | (1.9)
Other operating expense, net |  |  |  |  |  |  |  |  | (1.1) | (1.0) | 1.2
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (1.1) | (1.1) | (1.6)
Net income (loss) |  |  |  |  |  |  |  |  | (8.9) | (9.7) | 0.5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gain (loss) on financial instruments |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  | (0.2) | (0.2) | (0.2)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.0
Net income (loss) |  |  |  |  |  |  |  |  | $ (0.1) | $ (0.1) | $ (0.2)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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