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Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | $ 7.9 | $ 0.5 | $ 8.9 | $ (18.5)
Tax | 1.5 | 0.8 | (3.3) | 4.1
Net of Tax | 9.4 | 1.3 | 5.6 | (14.4)
Net gain (loss) on pension and OPEB liability adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 1.2 | 1.1 | 2.3 | 1.8
Tax | (0.4) | (0.3) | 0.2 | (0.5)
Net of Tax | 0.8 | 0.8 | 2.5 | 1.3
Unrealized (loss) gain on derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | (2.6) | 0.2 | 3.8 | (15.4)
Tax | 1.8 | (0.3) | (0.2) | 2.6
Net of Tax | (0.8) | (0.1) | 3.6 | (12.8)
Unrealized gain (loss) on foreign currency translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 9.3 | (0.8) | 2.8 | (4.9)
Tax | 0.1 | 1.4 | (3.3) | 2.0
Net of Tax | $ 9.4 | $ 0.6 | $ (0.5) | $ (2.9)

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