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Accumulated Other Comprehensive Loss (AOCL) - Changes In Components Of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, start | $ 546.1 | $ 675.0 | $ 762.2
Impact of ASU 2018-02 |  |  | 1.3
Other comprehensive (loss) before reclassifications | 31.6 | (13.5) | (12.7)
Net amount reclassified to net income (loss) | 4.9 | 4.5 | 2.9
Balance, end | 421.0 | 546.1 | 675.0
Cost of goods sold | 2,088.3 | 1,641.6 | 1,860.5
Selling, general and administrative expenses | 57.6 | 43.5 | 47.4
Other operating expense, net | 0.6 | 0.5 | 0.8
Income tax benefit (expense) | (30.6) | (3.1) | (8.4)
Net income (loss) | 167.1 | 123.3 | 80.8
Defined benefit plan and other postretirement liabilities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, start | (120.6) | (111.7) | (100.7)
Impact of ASU 2018-02 |  |  | 1.3
Other comprehensive (loss) before reclassifications | 31.6 | (13.5) | (12.7)
Net amount reclassified to net income (loss) | 5.0 | 4.6 | 3.0
Balance, end | (84.0) | (120.6) | (111.7)
Unrealized gain (loss) on financial instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, start | 1.8 | 1.9 | 2.0
Impact of ASU 2018-02 |  |  | 0.0
Other comprehensive (loss) before reclassifications | 0.0 | 0.0 | 0.0
Net amount reclassified to net income (loss) | (0.1) | (0.1) | (0.1)
Balance, end | 1.7 | 1.8 | 1.9
Accumulated other comprehensive loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, start | (118.8) | (109.8) | (98.7)
Balance, end | (82.3) | (118.8) | (109.8)
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plan and other postretirement liabilities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cost of goods sold | 26.8 | (4.7) | (3.2)
Selling, general and administrative expenses | 2.9 | (2.0) | (4.4)
Other operating expense, net | 7.3 | (1.1) | (1.0)
Income tax benefit (expense) | (0.4) | (1.1) | (1.1)
Net income (loss) | 36.6 | (8.9) | (9.7)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gain (loss) on financial instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cost of goods sold | (0.1) | (0.2) | (0.2)
Income tax benefit (expense) | 0.0 | 0.1 | 0.1
Net income (loss) | $ (0.1) | $ (0.1) | $ (0.1)

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