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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | $ 1.7 | $ (33.3) | $ (1.0) | $ (20.9)
Tax | 0.4 | 0.3 | 3.8 | (1.3)
Other comprehensive income (loss) | 2.1 | (33.0) | 2.8 | (22.2)
Net gain (loss) on pension and OPEB liability adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 0.8 | 1.1 | 0.2 | 2.2
Tax | 0.2 | (0.3) | 1.3 | (0.7)
Other comprehensive income (loss) | 1.0 | 0.8 | 1.5 | 1.5
Unrealized (loss) gain on derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | (1.0) | (4.4) | (1.5) | (2.6)
Tax | 0.1 | 1.4 | 0.1 | 1.3
Other comprehensive income (loss) | (0.9) | (3.0) | (1.4) | (1.3)
Unrealized gain (loss) on foreign currency translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 1.9 | (30.0) | 0.3 | (20.5)
Tax | 0.1 | (0.8) | 2.4 | (1.9)
Other comprehensive income (loss) | $ 2.0 | $ (30.8) | $ 2.7 | $ (22.4)

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