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Summary of Significant Accounting Policies - Changes in the Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | $ 5.7 | $ (2.9) |
Tax | 5.0 | 4.8 |
Other comprehensive income (loss) | 10.7 | 1.9 | $ (30.2)
Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (31.3)
Tax |  |  | (3.8)
Other comprehensive income (loss) |  |  | (35.1)
Pension and OPEB liability adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 5.0 | 2.5 |
Tax | (1.2) | 1.4 |
Other comprehensive income (loss) | 3.8 | 3.9 |
Pension and OPEB liability adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (0.9)
Tax |  |  | (2.4)
Other comprehensive income (loss) |  |  | (3.3)
Derivative instrument adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (10.8) | (2.9) |
Tax | 1.2 | 0.0 |
Other comprehensive income (loss) | (9.6) | (2.9) |
Derivative instrument adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (2.4)
Tax |  |  | 1.4
Other comprehensive income (loss) |  |  | (1.0)
Unrealized foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 11.5 | (2.5) |
Tax | 5.0 | 3.4 |
Other comprehensive income (loss) | $ 16.5 | $ 0.9 |
Unrealized foreign currency translation adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (28.0)
Tax |  |  | (2.8)
Other comprehensive income (loss) |  |  | $ (30.8)

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