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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | $ (12.4) | $ (2.5) | $ (13.4) | $ (23.4)
Tax | (1.0) | (0.1) | 2.8 | (1.4)
Other comprehensive (loss) | (13.4) | (2.6) | (10.6) | (24.8)
Net gain (loss) on pension and OPEB liability adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | 0.7 | 1.0 | 0.9 | 3.2
Tax | (0.6) | (0.2) | 0.7 | (0.9)
Other comprehensive (loss) | 0.1 | 0.8 | 1.6 | 2.3
Unrealized (loss) gain on derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | (4.1) | (0.4) | (5.6) | (3.0)
Tax | 1.1 | 0.0 | 1.2 | 1.3
Other comprehensive (loss) | (3.0) | (0.4) | (4.4) | (1.7)
Unrealized (loss) gain on foreign currency translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax | (9.0) | (3.1) | (8.7) | (23.6)
Tax | (1.5) | 0.1 | 0.9 | (1.8)
Other comprehensive (loss) | $ (10.5) | $ (3.0) | $ (7.8) | $ (25.4)

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