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Other Comprehensive Loss - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | $ (0.9) | $ (19.0)
Tax | (2.9) | 3.3
Net of Tax | (3.8) | (15.7)
Net gain (loss) on pension and OPEB liability adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | 1.1 | 0.7
Tax | 0.6 | (0.2)
Net of Tax | 1.7 | 0.5
Unrealized gain (loss) on derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | 4.5 | (15.6)
Tax | (0.1) | 2.9
Net of Tax | 4.4 | (12.7)
Unrealized (loss) gain on foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (6.5) | (4.1)
Tax | (3.4) | 0.6
Net of Tax | $ (9.9) | $ (3.5)

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