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Other Comprehensive Loss - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | $ (19.0) | $ (2.7)
Tax | 3.3 | 3.4
Other comprehensive (loss) income | (15.7) | 0.7
Net gain (loss) on pension and OPEB liability adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | 0.7 | (0.6)
Tax | (0.2) | 1.1
Other comprehensive (loss) income | 0.5 | 0.5
Unrealized (loss) gain on derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (15.6) | (0.5)
Tax | 2.9 | 0.0
Other comprehensive (loss) income | (12.7) | (0.5)
Unrealized (loss) gain on foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (4.1) | (1.6)
Tax | 0.6 | 2.3
Other comprehensive (loss) income | $ (3.5) | $ 0.7

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