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Other Comprehensive Loss - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | $ 7.7 | $ (12.4) | $ (10.8) | $ (13.4)
Tax | 1.1 | (1.0) | 5.2 | 2.8
Other comprehensive income (loss) | 8.8 | (13.4) | (5.6) | (10.6)
Net gain (loss) on pension and OPEB liability adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 1.1 | 0.7 | 2.9 | 0.9
Tax | (0.3) | (0.6) | (0.8) | 0.7
Other comprehensive income (loss) | 0.8 | 0.1 | 2.1 | 1.6
Unrealized gain (loss) on derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 1.1 | (4.1) | (14.3) | (5.6)
Tax | (0.3) | 1.1 | 2.3 | 1.2
Other comprehensive income (loss) | 0.8 | (3.0) | (12.0) | (4.4)
Unrealized gain (loss) on foreign currency translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 5.5 | (9.0) | 0.6 | (8.7)
Tax | 1.7 | (1.5) | 3.7 | 0.9
Other comprehensive income (loss) | $ 7.2 | $ (10.5) | $ 4.3 | $ (7.8)

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