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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | $ (3.0) | $ 5.7 |
Tax | (4.1) | 5.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total | (7.1) | 10.7 | $ 1.9
Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (2.9)
Tax |  |  | 4.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total |  |  | 1.9
Pension and OPEB liability adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 8.9 | 5.0 |
Tax | (2.8) | (1.2) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total | 6.1 | 3.8 |
Pension and OPEB liability adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | 2.5
Tax |  |  | 1.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total |  |  | 3.9
Derivative instrument adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 11.9 | (10.8) |
Tax | (0.7) | 1.2 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total | 11.2 | (9.6) |
Derivative instrument adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (2.9)
Tax |  |  | 0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total |  |  | (2.9)
Unrealized foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (23.8) | 11.5 |
Tax | (0.6) | 5.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total | $ (24.4) | $ 16.5 |
Unrealized foreign currency translation adjustments | Including cumulative effect adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax |  |  | (2.5)
Tax |  |  | 3.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total |  |  | $ 0.9

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