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Other Comprehensive Income - Changes in Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | $ (2.7) | $ 12.4
Tax | 3.4 | (1.6)
Other comprehensive income | 0.7 | 10.8
Unrealized gain (loss) on pension and OPEB liability adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (0.6) | 1.1
Tax | 1.1 | (0.4)
Other comprehensive income | 0.5 | 0.7
Unrealized (loss) gain on derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (0.5) | 1.8
Tax | 0.0 | (0.1)
Other comprehensive income | (0.5) | 1.7
Unrealized (loss) gain on foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-tax | (1.6) | 9.5
Tax | 2.3 | (1.1)
Other comprehensive income | $ 0.7 | $ 8.4

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